Contagionism is an old idea, but gained new life in Restoration Britain. The Germ of an Idea considers British contagionism in its religious, social, political and professional context from the Great Plague of London to the adoption of smallpox inoculation. It shows how ideas about contagion changed medicine and the understanding of acute diseases.

This book shows how contagionism evolved in eighteenth century Britain and describes the consequences of this evolution. By the late eighteenth century, the British medical profession was divided between traditionalists, who attributed acute diseases to the interaction of internal imbalances with external factors such as weather, and reformers, who blamed contagious pathogens. The reformers, who were often “outsiders,” English Nonconformists or men born outside England, emerged from three coincidental transformations: transformation in medical ideas, in the nature and content of medical education, and in the sort of men who became physicians. Adopting contagionism led them to see acute diseases as separate entities, spurring a process that reoriented medical research, changed communities, established new medical institutions, and continues to the present day.

Sweet and Clean? challenges the widely held beliefs on bathing and cleanliness in the past. For over thirty years, the work of the French historian, George Vigarello, has been hugely influential on early modern European social history, describing an aversion to water and bathing, and the use of linen underwear as the sole cleaning agent for the body. However, these concepts do not apply to early modern England. Sweet and Clean? analyses etiquette and medical literature, revealing repeated recommendations to wash or bathe in order to clean the skin. Clean linen was essential for propriety but advice from medical experts was contradictory. Many doctors were convinced that it prevented the spread of contagious diseases, but others recommended flannel for undergarments, and a few thought changing a fever patient's linens was dangerous. The methodology of material culture helps determine if and how this advice was practiced. Evidence from inventories, household accounts and manuals, and surviving linen garments tracks underwear through its life-cycle of production, making, wearing, laundering, and final recycling. Although the material culture of washing bodies is much sparser, other sources, such as the Old Bailey records, paint a more accurate picture of cleanliness in early modern England than has been previously described. The contrasting analyses of linen and bodies reveal what histories material culture best serves. Finally, what of the diseases-plague, smallpox, and typhus-that cleanliness of body and clothes were thought to prevent? Did following early modern medical advice protect people from these illnesses?