This article attempts a contextual study of the origin and early development of August Kekulé's theory of aromatic compounds. The terminus a quo is essentially August Hofmann's coining of the modern chemical denotation of ‘aromatic’ in 1855; the terminus ad quem is the first full codification of Kekulé's theory in the sixth fascicle of his Lehrbuch der organischen Chemie, published in the summer of 1866. Kekulé's theory is viewed in context with the earlier and concurrent experimental work of such chemists (...) as Hermann Kolbe, Friedrich Beilstein, Rudolph Fittig, and Hugo Müller. The reception of the theory is briefly examined. Attention is paid to the role of Kekulé's molecular models and of his celebrated dream anecdote of the snake that seizes its own tail. The episode is used as a case study for the continuity of scientific progress, and to illustrate the close reciprocal interactions of hypothesis and experiment in the evolution of a scientific theory. (shrink)

This essay examines the early career of the chemist Emil Erlenmeyer (1825–1909), focusing on his various endeavors in industrial consulting and entrepreneurship, and his eventual decisive turn, in 1862, to academic research and teaching. This case study offers insights into the developing relationship between theory-based academic research and artisanal and industrial practice in the German states during the 1850s and 1860s. Attention is paid to the relevance of this material to the contemporary historiography of “technoscience.”.

This essay describes the complexities, challenges, and pleasures of translating from German into English a charming fantasy about the world of molecules, published in 1882 by the chemist and historian Hermann Kopp (1817–1892).