The paper analyzes the early theory building process of Thomas Hunt Morgan from the 1910s to the 1930s and the introduction of the invisible gene as a main explanatory unit of heredity. Morgan’s work marks the transition between two different styles of thought. In the early 1900s, he shifted from an embryological study of the development of the organism to a study of the mechanism of genetic inheritance and gene action. According to his contemporaries as well as to historiography, Morgan (...) separated genetics from embryology, and the gene from the whole organism. Other scholars identified an underlying embryological focus in Morgan’s work throughout his career. Our paper aims to clarify the debate by concentrating on Morgan’s theory building—characterized by his confidence in the power of experimental methods, and carefully avoiding any ontological commitment towards the gene—and on the continuity of the questions to be addressed by both embryology and genetics. (shrink)

This thesis aims to propose and defend a new way of analysing and understanding the origin of genetics (from Mendel to Bateson). Traditionally philosophers used to analyse the history of genetics in terms of theories. However, I will argue that this theory-based approach is highly problematic. In Chapter 1, I shall critically review the theory-driven approach to analysisng the history of genetics and diagnose its problems. In Chapter 2, inspired by Kuhn’s concept “exemplar”, I shall make a new interpretation of (...) exemplar and introduce an exemplar-based approach. Before introducing my exemplar-based analysis, I find it necessary to scrutinise the origin of genetics from Mendel to Bateson. In Chapter 3, I shall reinterpret Mendel’s work on Pisum by re-examining Mendel’s paper (1865) and its historical research context. In Chapter 4, by carefully examining the conceptual changes, I argue that the rediscovery event in 1900 should be better characterised as attempts of incorporating Mendel’s work with the work of “rediscoverers” (i.e. de Vries, Correns, Tschermak, and Bateson) rather than a mere reintroduction to Mendel’s work. In Chapter 5, I shall use the exemplar-based approach to analysing and interpreting the origin of genetics from Mendel to Bateson. In Chapter 6, I shall defend my exemplar-based characterisation of the origin of genetics by dismissing the potential responses from the theory-driven one, critically examining a potential mechanism-based analysis, and making the further notes on the implication of taking the exemplar-based approach to investigate scientific practice. (shrink)

This paper examines medical scientists’ accounts of their rediscoveries and reassessments of old materials. It looks at how historical patient files and brain samples of the first cases of Alzheimer’s disease became reused as scientific objects of inquiry in the 1990s, when a genetic neuropathologist from Munich and a psychiatrist from Frankfurt lead searches for left-overs of Alzheimer’s ‘founder cases’ from the 1900s. How and why did these researchers use historical methods, materials and narratives, and why did the biomedical community (...) cherish their findings as valuable scientific facts about Alzheimer’s disease? The paper approaches these questions by analysing how researchers conceptualised ‘history’ while backtracking and reassessing clinical and histological materials from the past. It elucidates six ways of conceptualising history as a biomedical matter: scientific assessments of the past, i.e. natural scientific understandings of ‘historical facts’; history in biomedicine, e.g. uses of old histological collections in present day brain banks; provenance research, e.g. applying historical methods to ensure the authenticity of brain samples; technical biomedical history, e.g. reproducing original staining techniques to identify how old histological slides were made; founding traditions, i.e. references to historical objects and persons within founding stories of scientific communities; and priority debates, e.g. evaluating the role particular persons played in the discovery of a disease such as Alzheimer’s. Against this background, the paper concludes with how the various ways of using and understanding ‘history’ were put forward to re-present historic cases as ‘proto-types’ for studying Alzheimer’s disease in the present. (shrink)

When it comes to knowing about the scientific pasts that might have been – the so-called ‘counterfactual’ history of science – historians can either debate its possibility or get on with the job. The latter course offers opportunities for engaging with some of the most general questions about the nature of science, history and knowledge. It can also yield fresh insights into why particular episodes in the history of science unfolded as they did and not otherwise. Drawing on recent research (...) into the controversy over Mendelism in the early twentieth century, this address reports and reflects on a novel teaching experiment conducted in order to find out what biology and its students might be like now had the controversy gone differently. The results suggest a number of new options: for the collection of evidence about the counterfactual scientific past; for the development of collaborations between historians of science and scientific educators; for the cultivation of more productive relationships between scientists and their forebears; and for a new seriousness and self-awareness about the curiously counterfactual business of being historical. (shrink)

This paper examines medical scientists’ accounts of their rediscoveries and reassessments of old materials. It looks at how historical patient files and brain samples of the first cases of Alzheimer’s disease became reused as scientific objects of inquiry in the 1990s, when a genetic neuropathologist from Munich and a psychiatrist from Frankfurt lead searches for left-overs of Alzheimer’s ‘founder cases’ from the 1900s. How and why did these researchers use historical methods, materials and narratives, and why did the biomedical community (...) cherish their findings as valuable scientific facts about Alzheimer’s disease? The paper approaches these questions by analysing how researchers conceptualised ‘history’ while backtracking and reassessing clinical and histological materials from the past. It elucidates six ways of conceptualising history as a biomedical matter: (1) scientific assessments of the past, i.e. natural scientific understandings of ‘historical facts’; (2) history in biomedicine, e.g. uses of old histological collections in present day brain banks; (3) provenance research, e.g. applying historical methods to ensure the authenticity of brain samples; (4) technical biomedical history, e.g. reproducing original staining techniques to identify how old histological slides were made; (5) founding traditions, i.e. references to historical objects and persons within founding stories of scientific communities; and (6) priority debates, e.g. evaluating the role particular persons played in the discovery of a disease such as Alzheimer’s. Against this background, the paper concludes with how the various ways of using and understanding ‘history’ were put forward to re-present historic cases as ‘proto-types’ for studying Alzheimer’s disease in the present. (shrink)

Advocates of “Mendelism” early on stressed the usefulness of Mendelian principles for breeders. Ever since, that usefulness—and the favourable opinion of Mendelism it supposedly engendered among breeders—has featured in explanations of the rapid rise of Mendelian genetics. An important counter-tradition of commentary, however, has emphasized the ways in which early Mendelian theory in fact fell short of breeders’ needs. Attention to intellectual property, narrowly and broadly construed, makes possible an approach that takes both the tradition and the counter-tradition seriously, by (...) enabling a more complete description of the theory-reality shortfall and a better understanding of how changing practices, on and off the Mendelians’ experimental farms, functioned to render that shortfall unproblematic. In the case of plant breeding in Britain, a perennial source of lost profits and disputes over ownership was the appearance of individual plants departing from their varietal types—so-called “rogues.” Mendelian plant varieties acquired a reputation for being rogue-free, and so for demonstrating the correctness of Mendelian principles , at a time when Mendelians were gradually taking control of the means for distributing their varieties. Mendelian breeders protected their products physically from rogue-inducing contamination in such a way that when rogues did appear, the default explanation—that contamination had somehow occurred—ensured that there was no threat to Mendelian principles. (shrink)

This article offers a close examination of a small selection of pedigrees taken from German Mendelian and eugenic scholarship of the 1920s and 1930s. It examines the procedures that became customary for presenting data on human inherited pathologies, as well as the frequent changes in the information content of those charts. Relevant biographical and genealogical data was removed, and important indications regarding the diagnostic methods applied by the investigating scholar were lost, as soon as a pedigree was charted or reproduced. (...) Data on healthy individuals was condensed, leading to an emphasis on the hereditary burden of pathological traits. At times, healthy individuals were entirely omitted, as were exogenous martial partners. These modifications paved the way for further theoretical amendments, including the addition of ‘carrier’ status to chosen individuals along the pedigree. With this addition, these pedigrees changed their ontological status, from empirical records of human reproduction to partially hypothetical illustrations of Mendelian theory itself. This process was complemented by the representation of theoretical genetic models in the format of a human pedigree. A comparison to practices of charting pedigrees still common today suggests that the processes hereby revealed are far from exceptional. In line with the ideas put forward by Ludwik Fleck, they are interpreted as germane to the way scientific ideas are communicated and propagated and to the scientific culture of genetics. The article also offers a refinement to Fleck’s analysis of textbook construction, which highlights the extent to which textbook examples differ from the original data on which they are based. (shrink)