This paper studies European chemists’ shifting ontologies of materials by comparing the ways in which they classified materials. The focus is on plant materials, their different identities, and the changing ways chemists sorted out and ordered plant materials in the eighteenth and early nineteenth centuries. The main goals of the paper are to follow the development of plant materials from ordinary, everyday materials and commodities in the early eighteenth century to purified carbon compounds and organic substances familiar only to experts (...) in the 1830s, and to reconstruct chemists’ ways of classifying these objects in different practical and intellectual contexts.The study of changes in European chemists’ ways of classifying plant materials over more than a century brings to the foreground a trajectory of ontological shifts that is ‘punctuated’ in the 1750s, the 1790s, and the 1830s. Early eighteenth-century plant materials, which were commodities of the apothecary trade and other arts and crafts, were elevated epistemically as compound components or ‘proximate principles’ of plants in the 1750s, reduced to organic compounds in the 1790s, and replaced by carbon compounds in the 1830s. The last, third transformation of the epistemic constitution of materials and the mode of their classification was accompanied by a deep transformation of the material culture of plant chemistry. After the late 1830s, many of the eighteenth-century vegetable commodities disappeared from chemists’ agenda or were split into different substances individuated and identified in new ways. Coal tar products, and new organic artefacts containing chlorine or bromine, entered the chemical laboratory in the 1820s and became fused with the purified rest of the previous plant and animal substances. The material objects of the new culture of organic chemistry became detached from the materials applied in the extant arts and crafts. It was only in the late 1850s, with the rise of the synthetic dye industry, that a great number of these laboratory substances became involved in industrial production.Keywords: Commodities and scientific objects; Historical ontology; Classification; Plant chemistry; Organic chemistry. (shrink)

In the 18th century, the concept of ‘affinity’, ‘principle’ and ‘element’ dominated chemical discourse, both inside and outside the laboratory. Although much work has been done on these terms and the methodological commitments which guided their usage, most studies over the past two centuries have concentrated on their application as relevant to Lavoisier's oxygen theory and the new nomenclature. Kim's affinity challenges this historiographical trajectory by looking at several French chemists in the light of their private thoughts, public disputations and (...) communal networks. In doing so, she tells a complex story which points to the methodological and practical importance of industrial and medical chemistry. The following review highlights the advantages and snares of such an approach and makes a few historiographical points along the way. (shrink)

O objetivo deste artigo é investigar a concepção enciclopédica de revolução científica posta em prática pelo químico francês L.-B. Guyton de Morveau (1737-1816). Deslocando a análise do conhecimento químico das Luzes do programa traçado por Lavoisier (1743-1794), sugerimos uma concepção revolucionária republicana, proclamada como resultado do esforço de uma coletividade. Daremos destaque a três abordagens revolucionárias de Guyton de Morveau no âmbito da química. A primeira foi sua atuação no ensino dessa ciência, cuja pedagogia e métodos de ensino foram fundamentais (...) para sua imersão social. Além disso, entre 1770 e 1790, Guyton de Morveau teve desempenhos decisivos no seio da empresa enciclopédica e no seio da escola química francesa. (shrink)

SummaryThis essay explains why and how nineteenth-century chemists sought to stabilize the melting and boiling points of organic substances as reliable characteristics of identity and purity and how, by the end of the century, they established these values as ‘Constants of Nature’. Melting and boiling points as characteristic values emerge from this study as products of laboratory standardization, developed by chemists in their struggle to classify, understand and control organic nature. A major argument here concerns the role played by the (...) introduction of organic synthesis in driving these changes. Synthetic organic chemistry vastly increased the number of known organic substances, precipitating the chemical identity crisis of my title. Successful natural product synthesis, moreover, depended on chemists’ ability to demonstrate the absolute identity of synthetic product and natural target – something late nineteenth-century chemists eventually achieved by making reliable, replicable melting and boiling point measurements. In the period before the establishment of national standards laboratories, chemists and scientific glassblowers worked together to standardize melting and boiling points as physical constants, such collaborations highlighting the essential importance of chemical glassware and glassblowing skill in the development of nineteenth-century organic chemistry. (shrink)

In 1820, J. Pelletier and J.-B. Caventou, two French pharmacist-chemists working at the Ecole de Pharmacie of Paris, extracted quinine, a new substance, from cinchona bark. We use this example to illustrate the processes which lead from a crude natural product through the isolation of an active principle to the production of a pure manufactured drug. This allows us to discuss the development of chemical analysis in relation to pharmacy, natural history, medicine and the early pharmaceutical industry. The dynamics of (...) the disciplines involved here show how organic chemistry, which was developing rapidly during these crucial years, expanded and became autonomous. Theoretical aspects and practical innovations are relevant to the scientific methods developed by the first generation of those who integrated the new chemistry into their daily work. Beyond these historical issues, this paper aims to show how a holistic approach can contribute to the debate on discovery and invention in a science that is often considered empirical. (shrink)

How to turn chemistry into an exact science? For chemist Louis-Bernard Guyton de Morveau, the best procedure to achieve this goal was to use resources from theoretical physics as allies in the general delimitation of concepts belonging to that science. Thus, their results could be represented in a rational way and written in mathematical language. His dream was to produce concepts that could translate the dynamics of the material world through this physical chemistry. The key-concept of this dream was that (...) of chemical affinities. In addition to information relevant to understand the meaning of being a Newtonian in the Age of Enlightenment, Guyton de Morveau’s chemical thinking also suggests an alternative understanding of the so-called "chemical revolution". (shrink)

In this paper we examine the study of minerals from the Renaissance to the early nineteenth century in the light of the work of Michel Foucault on the history of systems of thought. In spite of a certain number of theoretical problems, Foucault's enterprise opens up to the historian of science a vast terrain for exploration. But this is the place neither for a general exegesis nor for a general criticism of his position; our aim here is the more modest (...) one of taking certain points from Foucault's study,The order of things, and seeing how far they can be extended into an area not explicitly considered in that work. (shrink)

I argue and demonstrate in this essay that interconnected systems of science and technology, or technoscience, existed long before the late nineteenth century, and that eighteenth-century chemistry was such an early form of technoscience. Based on recent historical research on the early development of carbon chemistry from the late 1820s until the 1840s—which revealed that early carbon chemistry was an experimental expert culture that was largely detached from the mundane industrial world—I further examine the question of the internal preconditions within (...) the expert culture of carbon chemistry that contributed to its convergence with the synthetic-dye industry in the late 1850s. I argue that the introduction of new types and techniques of organic-chemical reactions and organic substances in this experimental expert culture, along with the application of chemical formulae as paper tools for modeling reactions as well as the chemical constitution and structure of substances, enabled academic chemists to make specific, novel contributions to chemical technology and industry in the second half of the nineteenth century. (shrink)

Dos diferentes fatores associados a uma mudança de paradigma e, portanto, a uma revolução química, o menos discutido é o que envolve os assim chamados experimentos exemplares, mudanças radicais na metodologia de trabalho e nos procedimentos empíricos da química, mudanças e modificações estas que, no caso de uma ciência natural empírica, podem ter como consequência dados experimentais antes inacessíveis, levando, por fim, a uma nova abordagem de conceitos, hipóteses e teorias e desencadeando uma "revolução" química, um novo paradigma. Muito mais (...) do que uma revolução química, dever-se-ia optar por uma gradativa evolução química. Escolhemos três dessas situações como "exemplares": a modificação no procedimento empírico da química pneumática, com o uso da cuba pneumática contendo mercúrio; a introdução de novos métodos de extração de compostos orgânicos naturais, com a substituição do método pirogênico pelo de extração com solventes; um novo entendimento de "análise química", com a substituição da comparação de amostras tidas como autênticas pela decomposição do analito. (shrink)

: This essay addresses the difficulties that sociology as a discipline continues to experience in grasping the relations between technology, science and the social. I argue that these difficulties stem from a resolute centering of sociology on the social, which follows a generically Durkheimian blueprint. I elaborate a response to these difficulties which derives from recent lines of work in science and technology studies, and which entails a decentering of the social relative to the material and the conceptual, in terms (...) of both objects of analysis and explanatory formats. In order to display the direct sociological relevance of this approach, I move to the macro level, developing the conceptual apparatus of a decentered social theory via the discussion of a historical example of major sociological significance—the systematic gearing together of scientific research, technological innovation and industrial production that originated in the synthetic dye industry in the second half of the nineteenth century. Besides the interest of the topic itself, the aim is thus to exemplify in some detail what a decentered sociology might look like, both empirically and conceptually. (shrink)