ALEXANDER VON HUMBOLDT BETWEEN
ENLIGHTENMENT AND ROMANTICISM
MICHAEL DETTELBACH *
ABSTRACT - Since the late 19th century, the image of Alexander von Humboldt has
been fractured into that of the patient and assiduous fact-gatherer, devoted to measurement
and quantification, and that of the sensitive soul, awake to the unity and beauty of
the landscape. Concern with emotional and aesthetic responses to the natural world
was, however, central to Humboldt’s precise and quantitative approach to natural
history. The unity of his project may be better understood by exploring his youthful
immersion in Enlightenment debates over the nature of the human mind and the
possibility of rational knowledge of nature — debates which took on a special urgency
during the epoch of the French Revolution. Specifically, the reforms of natural history
which Humboldt proposed in the 1790s and practiced during his expedition to the
Americas (1799-1804) drew on the concepts and techniques of “analysis” developed
by the French Encyclopedists and refracted through German politics and philosophy.
Humboldt’s approach to natural history thus exemplifies the essential continuity
between Enlightenment doctrines of sensation and sensibility and Romantic assertions
of the unity of nature and the unique role of the naturalist in revealing that unity.
Like the historiography of natural science itself, historical assessments
of Alexander von Humboldt have ever been pulled between the
two poles of empiricism and idealism, Enlightenment and Romanticism.
The authors who contributed to the “wissenschaftliche Biographie” of
1872 operated with a conception of scientific knowledge as the product
of careful experiment and observation, guided by a creative theoretical
genius, a sense for the unity of Nature.1 To these early biographers,
Humboldt stood as the bastion of Enlightenment empiricism through the
dark years of Hegelian idealism, and they found themselves somewhat
embarrassed when they sought to sum up their hero’s
“wissenschaftliche Leistung” in their final volume. The Leipzig astronomer
Karl Bruhns, for example, could not describe Humboldt as a
creative, theoretical scientist: “Humboldt’s ganze Richtung,” Bruhns
wrote, “ging weniger auf das Schaffen in den exakten Wissenschaften,
als auf das Sammeln” (iii: 3). Bruhns and his collaborators repeatedly
praised Humboldt’s “Gewissenhaftigkeit und Fleiß” (iii: 50) in observ-
Proceedings: Alexander von Humboldt’s Natural History Legacy and Its Relevance for Today
2001 Northeastern Naturalist Special Issue 1:9-20
* Boston University, Boston , MA 01063. mdettelb@bu.edu.
1 Karl Bruhns, ed., Alexander von Humboldt. Eine wissenschaftliche Biographie, 3 vols.
(Leipzig, 1872). For a more complex interpretation of Humboldt’s relationship with the
Hegelian school, see my introduction to Humboldt’s Cosmos (Baltimore: Johns Hopkins
University Press, 1997), Vol. 2, pp. xiv, xlii n. 20.
10 Northeastern Naturalist Special Issue 1
ing and measuring nature, but this only emphasizes their difficulty. The
meteorologist Alfred Dove summed up: “Die eigentlichen Fortschritte,
die unser wissenschaftliches Erkennen Humboldt direct verdankt [...]
lassen sich ohne Mühe zählen und messen.” In der Geistesgeschichte,
fährt Dove fort, muß man eine “active-schöpferisch” und eine “passiveempfängliche”
Genialität unterscheiden, wie Spinoza zwischen natura
naturans und natura naturata unterschieden hat. Humboldt war von der
passiven Genialität geprägt, die “in aufnehmender Seele das geistige
Licht ihrer Gegenwart sammelt, und so der Zukunft wenigstens ein
Abbild [kein Vorbild, meinte Dove] darbietet, aus dem sie betrachtend
Genuss und Lehre zugleich gewinnen mag” (ii: 481-482). In short, by
casting Humboldt as the bastion of empiricism against the excesses of
Romantic idealism, they were forced to demote him to the role of
patron, organizer, supporter, popularizer, contributor to the scientific
work of others, but ultimately not a scientist himself!
Similarly, there was little unity to the collection of observational and
descriptive concerns that in Anglo-American historiography goes under
the name of “Humboldtian Science” (coined by Susan Cannon in 1977),
only an encyclopedic dedication to the systematic and precise measurement
of as many physical parameters as possible.2 Conversely, in the
post-war period, especially among geographers and historians of geography,
a newly romanticized Humboldt was discovered, a proto-ecologist
or “human geographer,” in both German and in Anglo-American
historiography. Others have felt compelled to attribute to Humboldt
some form of holism, organicism, or even materialist determinism in
order to give ideal unity to what they see as an otherwise hopelessly
scattered empiricism. Several have stressed Humboldt’s indebtedness to
the transcendental philosophy of Immanuel Kant. For instance, in a very
widely read though never published doctoral dissertation completed at
Berkeley in 1971, Anne Macpherson argued that the unity and rationale
of Humboldt’s physical geography lay in a vitalism underwritten by
Kantian metaphysics. “Humboldt’s work for fifty years was informed
by an underlying metaphysical structure that he derived from the critical
writings of Immanuel Kant,” wrote Macpherson. “Humboldt’s Kantian
philosophy directed his own investigations of nature, and gave form and
unity to his writing.”3 More recently and more typically, Malcolm
Nicolson traced the origins of Humboldt’s plant geography to the idealism
of the German Romantics and Naturphilosophen. Though rigor-
2 Susan Cannon, Science in Culture (New York: Dawson and Science History Publications,
1978), chapter 4.
3 Anne Macpherson, “The Human Geography of Alexander von Humboldt,” Dissertation, University
of California, Berkeley, 1971; Richard Hartshorne, “The Concept of Geography as a
Science of Space, from Kant and Humboldt to Hettner,” Annals of the Association of American
Geographers. 48 (1958): 97-108, and more generally, “The Nature of Geography,” Annals of
the American Association of Geographers, 29 (1939), pp. 171-658.
2001 M. Dettelbach 11
ously empirical in practice, Nicolson argues, Humboldt’s geography
was underwritten by the “Romantic” belief that Nature was an organic
whole, and that “Man’s aesthetic sensitivities could ... transcend the
limitations of reason, beyond the surface of phenomena and, sensuously
and intuitively, grasp the underlying unities of Nature.”4
So struggles over the nature of Humboldt’s scientific work have long
been struggles over the nature of science itself, and especially over the
roles of experience and insight, observation and theory, the Enlightenment
and the Romantic “reaction.” However, recent historiographical developments
make it possible to dismantle the polarity between Enlightenment
empiricism and Romantic idealism, and to view Humboldt’s commitment
to empiricism as itself the rationale for his encyclopedic project and at the
same time as that which links him with the efforts of the early Romantics.
Historians have long seen a commitment to “empiricism” as a hallmark of
Enlightenment science and philosophy, but only relatively recently have
the sociology and history of the natural sciences problematized the authority
of experience itself. Also, interest in the social and intellectual construction
of “public opinion” in the Enlightenment has directed historians’
attention to the ways in which a self-identified “enlightened public” used
this “empiricism” to establish its moral and philosophical authority.
Epistemology has returned to the center of historical interpretations of the
Enlightenment, but now as a loose and evolving literature including
psychology, physiology, and anthropology, collected under the general
idea of “sciences of man.” In the Enlightenment, “science of man”
described not a particular scientific discipline or even a proto-discipline,
but the general character of science itself.5 Every true science was a
branch of the science of Man, that is, was appropriate to human nature and
measured itself according to human faculties. David Hume, in the preface
to Treatise of Human Nature (1739-40), offered probably the most famous
claim that a “science of man” would supply a new foundation to all
sciences. Success in natural and moral philosophy, Hume argued, required
mastering “the capital or center of these sciences ... human nature itself. In
undertaking an explicitly “experimental” inquiry into the powers of the
human mind, Hume promised “a compleat system of the sciences, built on
a foundation almost entirely new, and the only one upon which they can
stand with any security.”6 The Encyclopedists founded their true system
of knowledge on Condillac’s account of the “generation and filiation of
knowledge” through the analysis of sensations. D’Alembert described the
4 Malcolm Nicolson, “Alexander von Humboldt, Humboldtian Science, and the Origins of the
Study of Vegetation,” History of Science, 25 (1987), pp. 178-180.
5 Sergio Moravia, Beobachtende Vernunft. Philosophie und Anthropologie in der Aufklärung
(Munich, 1973); idem, “The Enlightenment and the Sciences of Man,” History of Science, 17
(1980): 247-288.
6 David Hume, A Treatise of Human Nature, ed. L. A. Selby-Bigge (Oxford: Clarendon, 1978),
xv-xvi.
12 Northeastern Naturalist Special Issue 1
great compendium as simply “a systematic presentation of human experience.”
Diderot insisted that the necessary, natural principle of order is Man
himself. “Man is the single term from which one must begin, and to which
all must be brought back, if one wishes to please, to interest, to touch [the
reader], even in the most arid considerations, the driest details. Make an
abstraction of my existence and of the happiness of my fellow beings, and
what will the rest of nature matter to me?”7 It is no accident that scholars
generally now agree that we find the origins of the human and social
sciences in the 18th century: these sciences were constituted by the
reflections of Enlightenment philosophers, attempting to give a new
constitution to the republic of letters and to redescribe their authority in
new public situations.8
Enlightenment “empiricism,” then, was itself predicated on a set of
empirical sciences of the mind and human nature, and Humboldt can be
viewed as an heir to this Enlightenment project. Humboldt’s scientific
and technical work in the 1790s was devoted to elaborating a philosophical
stance founded on the Enlightenment sciences of man, an
account of intellectual authority based on the powers of nature itself. We
can consider Humboldt’s natural scientific work to be a contribution to
this Enlightenment project because Humboldt develops his scientific
techniques in light of a specific account of human powers.
These Enlightenment critiques of the nature and authority of philosophical
knowledge characteristically drew support from contemporary
medicine and psychology. The pursuit of epistemology through experimental
physiology was a common feature of Enlightenment philosophy,
from the experimenters of the Royal Society and the physician
John Locke through Montesquieu, Maupertuis, Hartley, and Diderot, to
the early Romantics like Thomas Beddoes and Erasmus Darwin.9 The
discovery of novel powers in living matter in the 18th century supplied
both a didactic example of the primacy of experience over theory and
an important doctrine in accounts of the sensory origins of human
reasoning. Albrecht von Haller’s discovery of the “irritability”
(Reizbarkeit) of living tissue, Caspar Friedrich Wolff’s detection of a
7 Denis Diderot, “Encyclopédie.” In: Encyclopédie, ou Dictionnaire Raisonné des sciences, des
arts et des métiers. Nouvelle impression en facsimile , Vol. V (Paris, 1755; Stuttgart: Friedrich
Fromann, 1966), p. 641, col. 3-4.
8 Simon Schaffer, “Self-Evidence,” Critical Inquiry, 18 (1992), pp. 327-362; “Genius.” In
Andrew Cunningham and Nicholas Jardine, eds. Romanticism and the Sciences. Cambridge:
Cambridge University Press, 1989, pp. 82-100; “Natural Philosophy and Public Spectacle in
the 18th Century.” History of Science, 21 (1983), pp. 21-43; Andrew Cunningham and Nicholas
Jardine, “The Age of Reflexion.” In Cunningham and Jardine (Eds.), Romanticism and the
Sciences. Cambridge: Cambridge University Press, 1989. pp. 1-9.
9 Sergio Moravia, “Philosophie et médecine en France à la fin du XVIIIe siècle,” Studies in
Voltaire and the Eighteenth Century, 39 (1972): 1089-1151; Roy Porter, “Medical Science and
Human Science in the Enlightenment.” In Inventing Human Science. Von Christopher Fox und
Robert Wokler (Eds.), Berkeley: University of California Press, 1995. pp. 53-87.
2001 M. Dettelbach 13
“nisus formativus” in the growth of a chicken embryo, and Abraham
Trembley’s display of the regenerative powers of the hydra all served
as lessons in experimental philosophy, but also as support for an epistemology
based on sensation.
It is therefore not surprising to find that Humboldt offered his
strongest and most sustained critique of scientific method in his physiological
experiments. Experiments on the sensitivity of plant and animal
tissues to chemical changes preoccupied Humboldt in the 1790s,
before his expedition to the Americas. On one level, Humboldt’s physiological
work was dedicated to the investigation of the powers of living
matter, and especially the phenomenon of galvanism. But on another
level, Humboldt’s physiological experiments were dedicated to developing
a scientific method, a hermeneutics of experiment. Specifically,
Humboldt argued that the phenomena of life (Vitalität) in general, and
of galvanism in particular, could not be reduced to any single substance
or force. Alessandro Volta argued that galvanism was simply electricity;
others claimed to have discovered the true Lebenskraft in oxygen,
hydrogen, Azot, phlogiston, Lichtstoff, or various combinations thereof,
and that life was a process of “phlogistication,” “oxydation,” or “combustion;”
devotees of the extremely fashionable medical theories of the
Scotsman John Brown believed that life was the product of the “excitability”
(Erregbarkeit) of living matter. Whether motivated by the
vanity and ambition of the philosopher, the enthusiasm of the humanitarian,
or the plain greed of the charlatan, all such reductive theories of
life forced the phenomena themselves into human schemes and fit
Nature to human interests.
By contrast, Humboldt adopted a pose of theoretical abstinence.
Instead of using experiments to test hypotheses and subordinating observation
to the development of theory, Humboldt insisted that experiment
and observation had their own, internal dynamic. The principal
task of physical science, he claimed, was not to devise theories, but to so
vary a phenomenon in experiment that the conditions of its appearance
gradually emerged from the observations themselves. Repeatedly,
Humboldt described the job of the experimental philosopher as the
analysis or decomposition (Zergliederung) of physical phenomena and
of physical concepts.10 To make such variations and conditions visible,
10 E.g., Alexander von Humboldt, Versuche über die gereizte Muskel- und Nervenfaser, nebst
Vermuthungen über den chemischen Process des Lebens in den Thier- und Pflanzenwelt, 2
vols. (Berlin and Posen: Rottman, 1797-98), i: 295, 311, 324, 328; ii: 53, 95, 291; Über die
Zusammensetzung des Luftkreises (Braunschweig: Vieweg, 1799), p. 151. Humboldt’s account
of the meaning of experiment is very close to those which J.W. von Goethe and
Friedrich von Hardenberg (Novalis) developed in the 1790s. See Michael Dettelbach, “Romanticism
and Administration: Alexander von Humboldt’s Global Physics,” Ph.D. diss.,
University of Cambridge, 1993, pp. 95-99; Myles Jackson, “A Spectrum of Belief: Goethe’s
‘Republic’ versus Newtonian ‘Despotism’,” Social Studies of Science, 24 (1994): 673-701.
14 Northeastern Naturalist Special Issue 1
to make natural philosophy into a process of analyzing or decomposing
both phenomena and concepts, Humboldt created an abstract universal
script [Pasigraphie] in which chemical-physiological experiments
could be recorded and compared among one another. “Diese Art,
Naturerscheinungen zu behandeln, scheint mir am fruchtbarsten und
gründlichsten zu seyn. Thatsachen stehen fest, wenn das flüchtig
aufgeführte theoretische Lehrgebäude längst eingestürzt ist,” he wrote
in explaining his symbolic script in 1795.11 “Wohl dem Experimentator
aber, den abgeänderte Versuche von einer Theorie zur andern hinführen,
dessen Vermuthungen nicht früh eine Gewissheit erlangen, die von der
ferneren Beobachtung zurückscheut!”12
In separate physiological papers and ultimately in the synthetic
Versuche über die gereizte Muskel- und Nervenfaser (1797-98), he
identified this empiricism with Francis Bacon.13 Humboldt liberally
quoted aphorisms from the Novum Organum and prefaced the two
volumes of Versuche with an epigraph taken from Bacon’s Advancement
of the Sciences, the first part of the “Great Instauration,” which
advertised against the dangers of theorizing:
All forms of error reduce to the premature and peremptory reduction of
knowledge to arts and methods, from which time the sciences are seldom
improved; for as young men rarely grow in stature after their shape and
limbs are fully formed, so knowledge, whilst it lies in aphorisms and
observations, remains in a growing state; but when fashioned into methods
though it may be further polished, illustrated and fitted for use, it no
longer increases in bulk and substance.14
But Humboldt’s professed “Baconianism” was of a distinctly late-Enlightenment
kind. In both physiology and his philosophy of science,
Humboldt was much closer to his Enlightenment contemporary, the
English physician Erasmus Darwin (1731-1802), than to Francis Bacon
(1561-1626). In Zoonomia (1794), Darwin’s own exposition of the laws
of sensitive matter, Darwin demonstrated that theoretical reasoning was
a property of the arrangement of sensitive, living fibers and their natural,
organic “motions” (and for this reason he has often been considered
11 Alexander von Humboldt, “Ueber die gereizte Muskelfaser, aus einem Briefe an Herrn
Hofrath Blumenbach,” Neues Journal der Physik, 2 (1795): 115-129, p. 127.
12 Versuche über die gereizte Muskel- und Nervenfaser, i: 6. For a more extensive treatment of
Humboldt’s physiology and pasigraphy, see Dettelbach, “Romanticism and Administration,”
Chapter 3.
13 Michael Dettelbach, “Baconianism in Revolutionary Germany: Humboldt’s ‘Great
Instauration’,” in The Skeptical Tradition Around 1800, ed. Richard Popkin and Johan van
der Zande (Dordrecht: Kluwer, 1998), pp. 175-186.
14 Francis Bacon, Advancement of Learning (London: Colonial Press, 1900), 21. Quoted in part
in Versuche, title pages of both volumes, and in full in an article directed against Volta,
“Ueber die gereizte Muskelfaser, aus einem Briefe an Herrn Hofrath Blumenbach,” Neues
Journal der Physik, 2 (1795): 127.
2001 M. Dettelbach 15
a founder of scientific psychology).15 Similarly, Humboldt insisted that
the experimenter could (and must) observe the faculty of organic matter
to respond variously to varying stimuli and register the subtlest changes
in condition. But this power itself was hidden from experimental determination.
Humboldt clearly admired Darwin’s empirical physiology
and his account of experimental knowledge. He cited Zoonomia appreciatively
and often in the Versuche über die gereizte Muskel- und
Nervenfaser and inserted an excerpt from the “Ode to Erasmus Darwin”
(which prefaced later editions of Zoonomia) in support of his strictures
on the interpretation of experiment, and in defense against “den
Verdacht, als hielte ich das Leben selbst für einen chemischen
Prozess.”16 On Humboldt’s account, as on Darwin’s, experiment was
simply a conscious, methodical version of sensation itself, the detection
of subtle changes in condition; nerves and muscles were simply unconscious
analyzers. In short, the physiological work which dominated
Humboldt’s experimental efforts in the 1790s was as much an attempt to
articulate an Enlightenment epistemological stance, as it was a contribution
to physiology. The Versuche über die gereizte Muskel- und
Nervenfaser is concerned as much with defining the authority of experimental
knowledge as it is with the chemistry of living matter.
Humboldt’s physiological experiments are only the most explicit and
dramatic example of his attempt to expound a general hermeneutics of
experiment through experiment itself, the powers of the philosopher
through the powers of matter. His account of experiment as the analysis
(Zergliederung) of a complex whole applied as strictly to inanimate as to
animate Nature. Conversely, Nature itself must be treated as a complex
“Zusammenwirken der Kräfte,” to be analyzed by precise and subtle
variation of conditions (or by the precise measurement of these covariations
in nature).17 His symbolic languages or “pasigraphies” were as
applicable to geology as to physiology, and indeed the insistence on
quantitative precision that marks Humboldt’s science, from botany to
political economy, derived from an appreciation of number as a symbolic
language (“die letzten hieroglyphischen Zeichen”) through which phenomena
could be compared and correlated.18 The central role of
15 Roy Porter, “Erasmus Darwin: Doctor of Evolution?” In History, Humanity and Evolution.
James R. Moore (Ed.). Cambridge. Cambridge University Press, 1989, pp. 39-69.
16 Versuche über die gereizte Muskel- und Nervenfaser, ii: 39-40.
17 Michael Dettelbach, “The Face of Nature: Precise Measurement, Mapping, and Sensibility in
the Work of Alexander von Humboldt,” Studies in the History and Philosophy of Biology and
the Biomedical Sciences, 30 (1999): 473-504.
18 Hanno Beck, “Alexander von Humboldt’s ‘Essay de Pasigraphie,’ Mexico 1803/04”,
Forschungen und Fortschritte, 32 (1958), pp. 33-39; Alexander von Humboldt, Essai
géognostique sur le gisement des rochers dans les deux hémisphères (Paris, 1823), Appendix.
Kosmos, i. Humboldt’s little-noticed studies of the history of numbers treated numerical
languages on the model of philology, as symbolic systems for analyzing experience, subject
to a characteristic grammar. “Über die bei verschiedenen Völkern üblichen Systeme von
Zahlzeichen und über den Ursprung des Stellenwerthes in den indischen Zahlen,” Journal für
die reine und angewandte Mathematik, 4 (1829): 205-231.
16 Northeastern Naturalist Special Issue 1
Lavoisier’s chemistry in almost all this work derived from this essentially
methodological or epistemological commitment to reducing experimental
natural philosophy to analysis. In the Traité élémentaire de chimie (1789),
Lavoisier transformed the work of chemistry into the use of precise
instruments to detect changes in composition, and the use of symbolic
algebraic language to record those changes. While Humboldt was very
excited by the practical implications of Lavoisier’s isolation of oxygen
and hydrogen, his demonstration that water and alkali were composites of
invisible gases, and his discovery that combustion and respiration were
both forms of oxidation, and immediately applied these discoveries to
practical reforms, Lavoisier’s chemistry was still more important for its
methodological implications. Humboldt was carried away by “den
behutsamen Gang der Raisonnement” of the Traité. It seemed to him that
Lavoisier had not constructed a chemical theory or chemical system but
offered a “bloße Erzählung von Thatsachen.”19 In fact, to Humboldt,
Lavoisier’s chemistry suggested a complete “transcendentale Kritik der
Naturwissenschaften” that would restrict the work of natural philosophy
to the registration of variations made visible by precise instruments.20
Conversely, Humboldt strove to “transcendentalize” Lavoisier’s chemistry
by emptying it of all theoretical content and interpreting it as a pure
form of empirical thought, allowing Lavoisier’s elements and caloric
(Wärmestoff) purely nominal existence.21
A different formulation of “empiricism,” which Humboldt used indifferently
in his geological, physical, and physiological studies of the
1790s, derived directly from the Condillacian, encyclopedist lineage
which led to Lavoisier and the Idéologues:
Vouloir établir les théories avant d’avoir rassemblé les faits, construire
quand on n’a pas même encore observé, c’est un [sic] erreur qui de tout
tems a arrêté la marche de nos connoissance [sic].22
19 Humboldt to D.L.G. Karsten, Freiberg, 26 November 1791, Jugendbriefe Alexander von
Humboldts, ed. Fritz Lange and Ilse Jahn (Berlin: Akademie Verlag, 1973), pp. 161-162.
20 Humboldt to Georg Lichtenberg, 21 April 1792, Jugendbriefe Alexander von Humboldts, ed.
Fritz Lange and Ilse Jahn (Berlin: Akademie Verlag, 1973), pp. 183-185.
21 E.g., Aphorismen aus der chemischen Physiologie der Pflanzen (Leipzig: Voss, 1794), p. 5,
where Humboldt contrasts Lavoisier’s “elements” with the ultimate “Urstoffen der
Dinge...von denen uns aber der Geist dieses Jahrzehends und die bescheidnere Art zu
philosophieren, mehr zu dichten verbietet.” Also Versuche über die gereizte Muskel und
Nervenfaser, i: pp. 421-423.
22 Jean-Antoine-Nicolas Caritat, Marquis de Condorcet, Esquisse d’un tableau historique des
progrès de l’esprit humain. Ouvrage posthume de Condorcet. 3eme éd. (Paris, Agasse An V
(1797)), p. 61; Neues Journal der Physik, 4 (1797): 140. Humboldt used the same quotation
from Condorcet as an epigraph to a paper on the nature of light read before the Berlin
Gesellschaft Naturforschender Freunde in October, 1796, published in Ilse Jahn, “Alexander
von Humboldt und die Schwierigkeiten eines Paradigmenwechsels,” Leopoldina Jahrbuch
1994, row 3, 40 (1995): 431-453. Also cf. Versuche, ii: 125 ff. on dangers of substantives like
irritability, magnetism, electricity, heat etc. in becoming crutches of the mind and slowing
progress of the sciences.
2001 M. Dettelbach 17
This statement echoes the Baconian epigraph to the Versuche über die
gereizte Muskel- und Nervenfaser: premature theorizing stunts the
growth of knowledge. It comes, however, from the Marquis de
Condorcet’s Esquisse d’un tableau historique des progrès de l’esprit
humain (1794). Condorcet based his statement of faith in intellectual
and material progress on an associationist epistemology derived from
Condillac and d’Alembert, which placed the ability to make analogies
and comparisons at the center of its account of Reason. Philosophical
and practical improvement went hand in hand. “‘Eine falsche, nicht
durch Erfahrung unterstützte Theorie schadet im bürgerlichen Leben
mehr, als alle Unwissenheit in wissenschaftlichen Grundsätzen. Die
Theorie muß aus der Praxis entstehen, noch besser wäre es, wenn sie in
der Praxis so versteckt bleiben könnte, daß sie immer als System
erschiene.’”23 Although this sounds like yet another version of the
sentiments Humboldt took from Bacon and Condorcet, it is a quotation
from the economist J. G. Büsch (1728-1800), director of the Hamburg
Handlungsakademie, which Humboldt attended 1790-91, and it concluded
his 1792 attempt to develop a theory of hallurgy, based on
Lavoisier’s new chemistry.
In collecting measurements and observations on a stunningly wide
variety of natural and social phenomena, Humboldt was being neither a
naive empiricist, nor a Romantic idealist, but engaging in an Enlightenment
redefinition of the authority of the philosopher. He was reconstructing
experimental philosophy as analysis. The duty of the empirical
philosopher was no longer to build theories, but to observe the covariation
of phenomena through more or less precise instruments and
lanugages. Romantic intellectuals and nature-philosophers were preoccupied
with the same project, redefining the philosopher. Humboldt’s
Romantic contemporaries admired not just Humboldt’s work, but
Humboldt himself, as a model of philosophical sensibility, a moral and
intellectual exemplar. Carl Ritter, professor of geography at the new
Friedrich-Wilhelms-Universität in Berlin, held Humboldt up as an example
of appropriate scientific sensibility for his students: Humboldt
recognized that geography was not principally about compiling maps
“mit kritischer Fleiß,” but about cultivating one’s “eigene
Naturanschauung” into the dynamic essence of nature.24 Similarly,
Georges Cuvier, professor of comparative anatomy at the Paris Muséum
and Humboldt’s collaborator, could not help admiring in Humboldt’s
Ansichten der Natur a man who observed Nature always comparatively,
always in relation to other phenomena:
23 Alexander von Humboldt, “Versuch über einige physikalische und chemische Grundsätze der
Salzwerkskunde,” Bergmännisches Journal, 5 (1792), p. 141
24 Carl Ritter, Erdkunde (Berlin: Reimer, 1817), i: 30.
18 Northeastern Naturalist Special Issue 1
Parcourant tous les climats, affrontant tous les dangers et toutes les
fatigues, il a observé plus de faits qu’aucun voyageur ... [mais] quand il
présente à son lecteur les grands tableaux de la nature il semble s’avoir
toujours contemplé; quand il rapproche les faits, rappelle et pèse les
opinions, il semble n’avoir jamais quitté la bibliothèque; quand il trace
l’esquisse de ses grands resultats: il semble s’être livré sans cesse à la
méditation.25
Philippe Albert Stapfer, the Helvetic Republic’s resident to Paris during
the First Empire, formulated Humboldt’s virtues more economically: he
was “Leibniz et Cook dans un seul homme.”26 Always travelling, always
observing, but always recollecting the limits of experience and the
demands of reason.
Not least of Humboldt’s admirers was F.W.J. Schelling, who at the
moment of Humboldt’s return to Europe was concerned with the reform
of higher education, and sought Humboldt’s support for a new periodical
devoted to medical reform. Schelling’s Naturphilosophie cultivated
that same dynamic sensibility towards experiment. Indeed, Schelling
welcomed Humboldt back to Europe as an Eroberer, whose conquests
were spiritual: Humboldt was the man who would finally restore to the
human spirit its ancient possession [ihres altes Besitztum], Nature.27
Along with other Naturphilosophen, Schelling regarded Humboldt as an
exemplary Naturforscher, not despite his devotion to precise measurement,
but because of it. By travelling with instruments “in constant
activity,” Humboldt showed each point on the earth’s surface to be the
product of global forces acting locally.
More surprising to those of us used to thinking of Humboldt as the
scourge of Naturphilosophie, Humboldt returned the compliment. In the
preface to the Ideen zu einer Geographie der Pflanzen, nebst einem
Naturgemälde der Tropenländer (1805), his first widespread appearance
before the German public after his return from America, Humboldt
adopted an appreciative and sympathetic position towards Schelling’s
1798 Von der Weltseele and Ideen zu einer Philosophie der Natur. He
expressed “happy and heartfelt interest in a system which, undermining
atomism ... promises to illuminate the phenomena of life, heat, magnetism,
and electricity, inaccessible to science until now.” Humboldt
wrote that Schelling’s Naturphilosophie was “the bold undertaking of
one of the most profound men of our century” because it demonstrated
“the possibility of reducing all natural phenomena to the incessant
25 Fonds Cuvier MS 3159, Bibliothèque de l’Institut de France. For the circumstances surrounding
Cuvier’s review, see Dettelbach, “Romanticism and Administration,” pp. 131-133.
26 Letter to Paulus Usteri, 19 December 1811, quoted in Rodolphe Luginbühl, Philippe-Albert
Stapfer (Paris: Librairie Fischbacher, 1888), p. 316.
27 F.W.J. Schelling to Humboldt, Würzburg, im Januar, 1805. Briefe deutscher Romantiker, ed.
Willi A. Koch (Leipzig: Dietrich Verlagsbuchhandlung, 1938), pp. 201-202.
2001 M. Dettelbach 19
conflict of elemental forces of matter.”28 By contrast, French natural
philosophers invested too much significance in their mathematical formulations
of experimental results; they interpreted mathematical symbols
as actual substances, not as signs of a dynamic interaction, and this
resulted in a mechanical and atomistic interpretation of nature. According
to Humboldt, the French were guilty of a faulty aesthetics: “Sie
haben für keine andre als mechanische und atomistische
Erklärungsarten Sinn, nirgend aber für eigentliche Kraft und Wirkung”
and lacked “die vollig natürliche Ansicht der Dinge.” The French lacked
sense for the dynamic meaning of observation and sensation; they had
no concept of experiment, he writes,”und die Wissenschaften die dies
verlangen, gelingen ihnen nicht.”29
And yet Humboldt was no Naturphilosoph. He and Schelling both
recognized that while Schelling was devoted to rational speculation,
Humboldt was devoted to the study of Nature through experiment and
observation. Both Schelling’s Ideen, the philosophical deduction of
Nature from elemental forces, and his own Ideen, the encyclopedic
empirical study of nature, were “Naturgemälde,” that is, pictures of
Nature appealing to the inner sensibilities of their audiences.
Schelling’s was, however, “eine Naturgemälde einer höherer Art.” But
they also agreed (at least in these early years of the century) that
die Naturphilosophie kann den Fortschritten der empirischen
Wissenschaften nie schädlich sein .... Steht dabei eine Menschenklasse
auf, welche es für bequemer hält, die Chemie durch die Kraft des Hirnes
zu treiben, als sich die Hände zu benetzen, so ist das weder Ihre Schuld
noch die der Naturphilosophie überhaupt.30
Of course, Humboldt would use exactly these words, thirty years later,
amidst the threat of religious and political reaction, to condemn
Naturphilosophie.31 By the time Humboldt returned to Berlin in 1827 to
preside over the Gesellschaft Deutscher Naturforscher und Ärzte and
hold his public lectures at the Singakademie, certainly, his appreciation
for Naturphilosophie had turned to hostility. In the era of reform, however,
Humboldt considered his hermeneutics of experiment and
Schelling’s Naturphilosophie complementary enterprises. Both
Humboldt’s project of encyclopedic measurement and observation and
28 Humboldt, “Ideen zu einer Geographie der Pflanzen,” in Schriften zur Geographie der
Pflanzen, ed. Hanno Beck (Darmstadt: Wissenschaftliche Buchgesellschaft, 1989), pp. 44-45.
29 Reported by Wilhelm von Humboldt in Paris, June, 1798, from a conversation with
Alexander. Wilhelm von Humboldts Gesammelte Schriften, vol. 14 (Berlin: B. Behr, 1916),
pp. 505-506.
30 Humboldt an Schelling, Paris, 1. Februar 1805. Briefe deutscher Romantiker, p. 204
31 Letter to Varnhagen von Ense, 1835. Briefe von Alexander von Humboldt an Varnhagen von
Ense, ed. Ludmilla Assing, 3rd ed. (Leipzig: F.A.Brockhaus, 1860).
20 Northeastern Naturalist Special Issue 1
Schelling’s quintessentially Romantic effort to demonstrate the identity
of Mind and Nature were dedicated to the cultivation of free individuals,
a Reason, free from the prejudices of theory, theology, or self-interest.
Or, as Humboldt promised his audience at the end of Ideen zu einer
Geographie der Pflanzen (1807), a “moralische Freiheit.”32
32 Humboldt, Ideen zu einer Geographie, ed. Hanno Beck, p. 63.