While symbolic colour use has always played a conspicuous role in science research and education, the use of colour in historic diagrams remains a lacuna in the history of science. Investigating the colour use in diagrams often means uncovering a whole cosmology that is not otherwise explicit in the diagram itself. The periodic table is a salient and iconic example of non-mimetic colour use in science. Andreas von Antropoff's (1924) rectangular table of recurrent rainbow colours is famous, as are Alcindo (...) Flores Cabral's (1949) application of colour in his round snail form, using the RGB scheme, and Mazurs's (1967) pine tree system, consisting of warm and cold colours that he attributed to specific groups of elements—an attribution that we can relate back to humoralism and alchemy. From the first periodic tables in the 19th century, individual researchers have used different colour regimes. While standardization may play an obvious role in chemistry and its diagrams, all the more impressive is the anarchistic use of colour in the various diagrams which continue to be created. This article focuses on periodic tables in chemical journals and text books, and explores and compares the development of colour codes found in the few existing polychrome diagrams from the 1920s to the 1970s. (shrink)

Labeling, Recovering and Reactivating: The Role of Labels on Microscope Slides in the Finding System on the Basis of Alzheimer's Auguste D. Preparations. This study discusses the role of labels in the process of the reactivation of preparations. Labels on slides together with corresponding lists on cards or sheets build what is here called a specific finding system. In the sciences of the archive the disciplinary memory together with such a finding system are the basis to the ability of the (...) sciences today to reactivate preparations from the beginning of the last century as it occurs with the Auguste D. preparations. The case of Alzheimer's micropreparations of brain parts of Auguste D. – the case that he used to show that hers was a specific brain disease unknown before – serves to describe Alzheimer's writing on the labels. It is compared to slides and labels prepared by other medical researchers between the 1890s and 1920s and the respective finding systems. Being an epistemologicum, micropreparations, as they are data, in their hybrid status of both image and material in one, cross the boundaries between icon and index. This is proven by the reactivation of Auguste D. micropreparations in molecular biological studies over 100 years after their production. (shrink)

We provide a detailed description of an interleaved and heavily annotated copy of Florae Berolinensis Prodromus, a flora of Berlin published by the German apothecary and botanist Karl Ludwig Willdenow in 1787, which today is preserved at the Staatsbibliothek zu Berlin – Preußischer Kulturbesitz. We demonstrate that this is the copy that the author himself used and carried with him during his botanical excursions in and around Berlin to prepare a second edition of the work. By analyzing this document as (...) paper technology, we reveal that even seemingly trifling aspects of its material organization enabled far-reaching biological research agendas that were not originally intended. The hybrid form of manuscript and printed book, used in field excursions, enabled a kind of natural-historical observation that was at once detailed and bound by strict convention, a combination that inadvertently opened new research questions and suggested new objects of research. We thereby contribute to an understanding of the history of natural history that goes beyond the history of ideas and the intended uses of techniques, giving an example of how routine work on paper within a scientific tradition could generate innovation. (shrink)