Edward Ballard and the Practice of Epidemiology in the 19th-Century United Kingdom.

This article recovers the history of Victorian epidemiology through the career of British physician Edward Ballard (1820-1897). Ballard's career provides a useful window into the practices of epidemiology in the 19th century because he held notable public health posts as medical officer of health for Islington and inspector at the Medical Department of the Local Government Board. By the time of his death, in 1897, he typified the transition toward professional epidemiology. In exploring some of the most important environmental and health-related problems in preventive medicine in the 19th century, Ballard was part of a group of influential epidemiologists who studied infectious disease. In particular, he was noted for his research into typhoid fever and industrial health. Yet Ballard's career has largely been forgotten. In this article, I explore Ballard's work as a window into the everyday practices of Victorian epidemiology and suggest that the process of professionalizing epidemiology in the 20th century was about forgetting epidemiology's Victorian past as much as it was about championing it.

A conflict of analysis: analytical chemistry and milk adulteration in Victorian Britain.

This article centres on a particularly intense debate within British analytical chemistry in the late nineteenth century, between local public analysts and the government chemists of the Inland Revenue Service. The two groups differed in both practical methodologies and in the interpretation of analytical findings. The most striking debates in this period were related to milk analysis, highlighted especially in Victorian courtrooms. It was in protracted court cases, such as the well known Manchester Milk Case in 1883, that analytical chemistry was performed between local public analysts and the government chemists, who were often both used as expert witnesses. Victorian courtrooms were thus important sites in the context of the uneven professionalisation of chemistry. I use this tension to highlight what Christopher Hamlin has called the defining feature of Victorian public health, namely conflicts of professional jurisdiction, which adds nuance to histories of the struggle of professionalisation and public credibility in analytical chemistry.

The perfect food and the filth disease: milk-borne typhoid and epidemiological practice in late Victorian Britain.

This article explores the initial set of epidemiological investigations in Victorian Britain that linked typhoid fever to milk from dairy cattle. Because Victorian epidemiologists first recognized the milk-borne route in outbreaks of typhoid fever, these investigations served as a model for later studies of milk-borne scarlet fever, diphtheria, and perhaps tuberculosis. By focusing on epidemiological practices conducted by Medical Inspectors at the Medical Department of the Local Government Board and Medical Officers of Health, I show that Victorian epidemiology was committed to field-based, observational methods that defined the professional nature of the discipline and its theories and practices. Epidemiological investigations of milk-borne typhoid heated up several important public health debates in the second half of the nineteenth century, and demonstrate how Victorian epidemiology was not solely wedded to examining population studies using statistical methods, as historians have typically argued, but also relied on observational case-tracing in individuals, animals, and even environments.