The ArgumentMicroscopical consideration played a crucial role in German physiology in the period of, grosso modo, 1780–1830. Specifically, a conception of material change was established, according to which all life is grounded in the process of the generation of microscopical forms out of an amorphous, primitive generative substance. Embryological development, tissue growth, and the generation of microorganisms were all considered to be the manifestation of this fundamental developmental process. In contrast to the common historiography, I try to understand Theodor Schwann's (...) 1838 discovery of the cell theory in terms of the epistemological categories he applied to the prevailing conceptions of life and living matter. I argue that Schwann was able to discern cells not because of any superior microscopical methods, but rather as part of his wider investigative endeavor to explicate life processes according to specific causal agents. I argue that Schwann was able to demonstrate the existence of cells only when he considered animal tissues in terms of a causal relation between specific material agents and their effect, that is, the developmental history of tissue. (shrink)

Traditionally, autoimmune disease has been considered to be a case of false recognition; the immune system mistakenly identifies 'self' tissues as foreign, attacking them thus causing damage and malady. Accordingly, the history of autoimmunity is usually told as part ot the history of immunology, that is, of theories and experiments relating to the ability of the immune system to discriminate between self and nonself. This paper challenges this view, claiming that the emergence of the notion of autoimmunity in the 1950s (...) must be considered as part of a long develolpment in thought about pathology throughout the twentieth century, namely the conceptualisaiton of disease as a reactive and self-destructive process. During the first part of the twentieth century this notion became one of the cornerstones of pathology and was increasingly employed for the explanation of the non-infections, slow-burning diseases. Thus, the category of chronic disease had been defined anew, now encompassing all those diseases characterised by a persistent inflammatory process. Inflammation, in turn, was conceived as double-eged physiological mechanism, which was usually the direct mediator of damage, of the essence of disease. The paper also shows how this kind of analysis could emable a unified historical discussion of autoimmunity and allergy, hitherto considered to have distinct conceptual origins. (shrink)