Our aim in this paper is to show the importance of the notion of économie animale in Montpellier vitalism as a hybrid concept which brings together the structural and functional dimensions of the living body – dimensions which hitherto had primarily been studied according to a mechanistic model, or were discussed within the framework of Stahlian animism. The celebrated image of the bee-swarm expresses this structural-functional understanding of living bodies quite well: “One sees them press against each other, mutually supporting each other, forming a kind of whole, in which each living part, in its own way, by means of the correspondence and directions of its motions, enables this kind of life to be sustained in the body” (Ménuret 1765c, Enc. XI, 319a). What is important here is that every component part is always a living part, i.e., every structural unit is always functional. Interestingly, while the twin notions of “animal economy” and organisation are presented as improvements over a mechanistic perspective, they are nonetheless compatible with an expanded sense of mechanism, and by extension, with materialism as reflected notably in the writings of Ménuret and Bordeu. We thus propose both a revision and reconstruction of the historical status of the “animal economy,” and a reflection on its conceptual status.

This paper considers how certain ideas elaborated by the Montpellier vitalists influenced the rise of French alienism, and how those ideas framed the changing view of passions during the eighteenth century. Various kinds of evidence attest that the passions progressively became the focus of medical attention, rather than a theme specific to moralists and philosophers. Vitalism conceived of organisms as animal economies understandable through the transformations of the various modes of their sensibility. This allowed some physicians to define a kind of anthropological program, which viewed human beings as a whole, with no distinction between le physique and le moral. The passions in this context became a specific alteration of the animal economy. Such an anthropological program was the framework within which Pinel understood the various classes of madness as disease – those troubles being general disturbances of the animal economy, which presupposed a knowledge of the latter, to be addressed and cured. In this view, and departing from the vitalist writers with regard to the specificity of mental illness as such, Pinel proposed another conception of the relations between passions and madness, and elaborated a general view of their status in etiology and therapeutics; those views were taken up and systematized by Esquirol, who finally defined a new kind of continuity between passion and madness, demonstrated by the idea that some kinds of madness that he called “monomania” had as a principle a “ruling passion” that the alienist, this novel medical specialist, had to unveil and address.

Eighteenth-century Montpellerian vitalism and contemporaneous French “vitalist” materialism, exemplified by the medical and biological materialism of La Mettrie and Diderot, differ in some essential aspects from some later forms of vitalism that tended to postulate immaterial vital principles or forces. This article examines the arguments defending the existence of vital properties in living organisms presented in the context of eighteenth-century French materialism. These arguments had recourse to technological metaphors and analogies, mainly clockworks, in order to claim that just as machines can have functional properties which its parts do not possess (e.g., showing time), so living organisms can, as material entities, also have organic or vital properties which its material parts do not possess. Such arguments, with the help of a healthy dose of epistemological scepticism, tend to strike a balance between two positions concerning the ontology of life which we now tend to label “vitalism” and “emergentism.” Although there is nothing inconsistent in viewing vital properties as emergent, some ambiguity results if one does not draw a clear distinction between properties and functions. The philosophical problems related to these ambiguities are revealed in Diderot's apparent hesitation concerning sentience as “a general property of matter or the product of organization.”

Montpellier vitalists upheld a medical perspective akin to modern “holism” in positing the functional unity of creatures imbued with life. While early vitalists focused on the human organism, Jean-Charles-Marguerite-Guillaume Grimaud investigated digestion, growth, and other physiological processes that human beings shared with simpler organisms. Eschewing modern investigative methods, Grimaud promoted a medically-grounded “metaphysics.” His influential doctrine of the “two lives” broke with Montpellier holism, classifying some vital phenomena as “higher” and others as “lower” and attributing the “nobility” of the human species to the predominance of the former. In place of Montpellier teaching that attributed health to the holistic equilibration of vital activities, Grimaud embraced spiritualist dualisms of soul and body, Creator and created. Celebrating the divinely-ordained “wisdom” evident in involuntary physiological processes, he argued that such life functions were incomprehensible to human investigators. While Grimaud's work encouraged inquiry into the division between the central and “vegetative” nervous systems that became paradigmatic in nineteenth-century neuroscience, it also opened Montpellier vitalism to charges of conservatism and obscurantism that are still lodged against it to the present day.

The question, how organisms obtain their specific complex and functional forms, was widely discussed during the eighteenth century. The theory of preformation, which was the dominant theory of generation, was challenged by different alternative epigenetic theories. By the end of the century it was the vitalist approach most famously advocated by Johann Friedrich Blumenbach that prevailed. Yet the alternative theory of generation brought forward by Caspar Friedrich Wolff was an important contribution to the treatment of this question. He turned his attention from the properties of matter and the forces acting on it towards the level of the processes of generation in order to explain the constitution of organismic forms. By regarding organic structures and forms to be the result of the lawfulness of ongoing processes, he opened up the possibility of a functional but non-teleological explanation of generation, and thereby provided an important complement to materialist and vitalist approaches.

This article addresses the doctrinal controversy over the various characterizations of irritability and sensibility. In the middle of the eighteenth century, this scientific debate involved some encyclopaedist physicians, Albrecht von Haller (1709–1777), Jean-Jacques Ménuret de Chambaud (1733–1815), and Théophile de Bordeu (1722–1776). The doctor from Bern described irritability as an experimental property of the muscle fibers and made it the basis of a neo-mechanism in which organic reactions are related to the degree of irritation of the fibers. The practitioners from Montpellier considered sensibility, a property of living matter, to be a spontaneous activity of the organ and developed around this notion an original conception of the organism as the sum of the specific lives of each part. Beyond conceptual divergences, two ways of thinking whose philosophical presuppositions (conception of living matter, mechanism, and organicism), were in opposition, while their epistemological principles (experience versus observation) and their medical practices (active medicine and expectant medicine) went on to evolve in different directions. The privileged place granted to experimentation and assessment enabled physiology to be articulated as an autonomous scientific discipline; the pre-eminence of observation and attention to the radical specificity of the living being constituted the bases of clinical medicine.