John Clark 1780 and 1792: learning from properly kept records

Clark J. Observations on the Diseases which Prevail in Long Voyages to Hot Countries. London: J Murray, 1792.

Clark J. Observations on the Diseases in Long Voyages to Hot Countries and Particularly on Those which Prevail in the East Indies. London: Printed for D. Wilson and G. Nicol, 1773.

3. Clark J. Observations on Fevers, Especially of the Continued Type. London: T Cadell, 1780.

Tröhler U. Quantification in British medicine and surgery 1750–1830, with special reference to its introduction into therapeutics. PhD Thesis, University of London, 1978: 346–396.

Tröhler U. To Improve the Evidence of Medicine: The 18th Century British Origins of a Critical Approach. Edinburgh: Royal College of Physicians, 2000: 59–68. This book is freely available.