This article examines the science of electrophysiology developed by Emil du Bois-Reymond in Berlin in the 1840s. In it I recount his major findings, the most significant being his proof of the electrical nature of nerve signals. Du Bois-Reymond also went on to detect this same ‘negative variation’, or action current, in live human subjects. In 1850 he travelled to Paris to defend this startling claim. The essay concludes with a discussion of why his demonstration failed to convince his hosts at the French Academy of Sciences.

La science ne consiste pas en faits, mais dans les conséquences que l'on en tire.Claude Bernard, Introduction à l'étude de la médicine expérimentale

Good talkers are only found in Paris.François Villon, Des Femmes de Paris

This article investigates visual methods in Victorian meteorology in the second half of the nineteenth century. While studies of visual representations in scientific work during this period have proliferated, there has been less attention paid to the relationships between scientific images and the broader visual culture in which they developed. Meteorology offers ideal ground for exploring visual culture and science, both because of the familiarity of the sky as an aesthetic subject, and because of the visual epistemology associated with popular forms of weather knowledge, called weather wisdom. Using examples from the study of clouds, especially the work of Charles Piazzi Smyth, the paper analyses the ways in which the challenges of meteorology raised questions about the nature of observation and precision. It concludes by suggesting that the broader context of Victorian visual culture must include the relationship of language and images, and traces those concerns in the history of cloud classification.

The group which worked with Lavoisier in his laboratory also collaborated with him in publication and jointly edited the journal Annales de chimie. It has a good claim to be considered as a research school. Most historians of chemistry, who have studied the ‘chemical revolution’ in France, have focused uniquely on Lavoisier, giving scant attention to his co-workers and ignoring his assistants, thus overlooking their collective research, which created something of a precedent for nineteenth-century science. It has also been too easily assumed that the Lavoisier story ends with his death in 1794. After his demise, continuity with his ideas and method of working was provided by his former associates, particularly Berthollet in the Society of Arcueil. Further continuity was provided by the successive careers of Gay-Lussac, Dumas and Wurtz. In an increasing spirit of nationalism in the nineteenth century there developed a strong French tradition which looked back to Lavoisier as the founder of modern chemistry and a source of inspiration for collaboration in chemical research.

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