The first section of this issue brings together four essays on “surfaces” – a subject matter which might seem conspicuous or, indeed, palpable enough. Just think of the sheets of paper, window panes, and haptic interfaces surrounding you: the world, evidently, is diffused with surfaces, membranes, and boundaries of all sorts. Some of these things have been salient, for obvious reasons in fields such as media studies, or implicit in notions such as “boundary object”: the retina, photographic plates, basilar membranes, the skin, or various forms of “displays” immediately come to mind. Not even mentioning their immense metaphoricity, surfaces are the entities that make things visible, inscribable, or knowable. But not all of them have been so salient. In fact, most surface-phenomena arguably – and, typically, for similarly obvious reasons – haven't received much scholarly notice at all: plastic wraps, lacquers, lubricants, coatings, silicon wavers, cell membranes, glass, plant leaves, the ozone layer.

This article explores the entangled histories of three imaging techniques in early nineteenth-century British physical science, techniques in which a dynamic event (such as a sound vibration or an electric spark) was made to leave behind a fixed trace on a sensitive surface. Three categories of “sensitive surface” are examined in turn: first, a metal plate covered in fine dust; second, the retina of the human eye; and finally, a surface covered with a light-sensitive chemical emulsion (a photographic plate). For physicists Michael Faraday and Charles Wheatstone, and photographic pioneer William Henry Fox Talbot, transient phenomena could be studied through careful observation and manipulation of the patterns wrought on these different surfaces, and through an understanding of how the imaging process unfolded through time. This exposes the often-ignored materiality and temporality of epistemic practices around nineteenth-century scientific images said to be “drawn by nature.”

In the winter of 1849–1850 in Königsberg, German physiologist Hermann von Helmholtz (1821–1894) conducted pioneering measurements concerning the propagation speed of stimulations in the living nerve. While recent historians of science have paid considerable attention to Helmholtz's uses of the graphic method, in particular his construction of an instrument called “myographion,” this paper draws attention to the inscription surfaces that he used in effective ways for capturing and transmitting his findings. Against the background of recent archival findings, I show that Helmholtz used isinglass copies of his graphical recordings in order to communicate the basic principle of previous measurements to the academic public. As the correspondence with his Berlin-based friend and colleague Emil du Bois-Reymond (1818–1896) and the subsequent development of the myographion make clear, these curves were not meant as measurements but functioned as demonstrations. In other words, Helmholtz's curves did provide “images of precision” (Olesko and Holmes 1993) – but they were not precise images.

Glass vessels such as flasks and test tubes play an ambiguous role in the historiography of modern laboratory research. In spite of the strong focus on the role of materiality in the last decades, the scientific glass vessel – while being symbolically omnipresent – has remained curiously neglected in regard to its materiality. The popular image or topos of the transparent, neutral, and quasi-immaterial glass container obstructs the view of the physico-chemical functionality of this constitutive inner boundary in modern laboratory environments and its material historicity. In order to understand how glass vessels were able to provide a stable epistemic containment of spatially enclosed experimental phenomena in the new laboratory ecologies emerging in the nineteenth and early twentieth century, I will focus on the history of the material standardization of laboratory glassware. I will follow the rise of a new awareness for measurement errors due to the chemical agency of experimental glass vessels, then I will sketch the emergence of a whole techno-scientific infrastructure for the improvement of glass container quality in late nineteenth-century Germany. In the last part of my argument, I will return to the laboratory by looking at the implementation of this glass reform that created a new oikos for the inner experimental milieus of modern laboratory research.

This paper brings together the history of risk and the history of DNA repair, a biological phenomenon that emerged as a research field in between molecular biology, genetics, and radiation research in the 1960s. The case of xeroderma pigmentosum (XP), an inherited hypersensitivity to UV light and, hence, a disposition to skin cancer will be the starting point to argue that, in the 1970s and 1980s, DNA repair became entangled in the creation of new models of the human body at risk – what is here conceptually referred to as the vulnerability aspect of body history – and new attempts at cancer prevention and enhancement of the body associated with the new flourishing research areas of antimutagenesis and anticarcinogenesis. The aim will be to demonstrate that DNA repair created special attempts at disease prevention: molecular enhancement, seeking to identify means to increase the self-repair abilities of the body at the molecular level. Prevention in this sense meant enhancing the body's ability to cope with the environmental hazards of an already toxic world. This strategy has recently been adopted by the beauty industry, which introduced DNA care as a new target for skin care research and anti-aging formulas.

The sect of ancient Greek physicians who believed that medical knowledge came from personal experience also read the Hippocratic Corpus intensively. While previous scholarship has concentrated on the contributions of individual physicians to ancient scholarship on Hippocrates, this article seeks to identify those characteristics of Empiricist reading methodology that drove an entire medical community to credit Hippocrates with medical authority. To explain why these physicians appealed to Hippocrates’ authority, I deploy surviving testimonia and fragments to describe the skills, practices, and ideologies of the reading community of ancient Empiricist physicians over the one-hundred year period 175 to 75 BCE. The Empiricist conception of testimony taken on trust operative within that reading community elided the modern distinction between personal and institutional targets of trust by treating Hippocratic writings as revelatory of the moral character of Hippocrates as an author. Hippocrates’ moral character as an honest witness who accurately observed empirical phenomena aligned with the epistemic virtues of an empirical medical community who believed that medical knowledge came from personal experience. So I argue that Empiricist reading culture constructed a moral authority of honesty and accuracy from Hippocratic writings, enlarged the personal authority of Hippocrates among medical readers, and contributed to the development of Hippocratism.

This paper examines the intertwined relations between eugenics and medical genetics from a Swedish perspective in the 1940s and 1950s. The Swedish case shows that a rudimentary form of genetic counseling emerged within eugenic practices in the applications of the Swedish Sterilization Act of 1941, here analyzed from the phenomenon of “heredophobia” (ärftlighetsskräck). At the same time genetic counseling also existed outside eugenic practices, within the discipline of medical genetics. The paper argues that a demand for genetic counseling increased in the 1940s and 1950s in response to a sense of reproductive responsibility engendered by earlier eugenic discourse. The paper also questions the claim made by theoreticians of biopolitics that biological citizens have emerged only during the last decades, especially in neoliberal societies. From the Swedish case it is possible to argue that this had already happened earlier in relation to the proliferation of various aspects of eugenics to the public.