394 STUDIES IN STATISTICS CHAP. CHAPTER XX. I'HE SEASONAL PREVALENCE OF CONTINUED FEVERS IN LONDON.! Bur fifty years ago the various species of continued fevers were commonly confounded together under the name of typhus, and, as a natural result, different writers pave most conflicting accounts of the symptoms and course of the disease, and likewise of the morbid appearances found after death. The honour of disentangling this sonfusion is mainly due to Gerhard and Pennock (1837), Stewart (1840), and Jenner (1849). In 1854, Murchison entered the arena, and made sarious contributions to the voluminous literature »f the subject; his classical Treatise on the Continued Fevers of Great Britain was published in 1862, and a second edition appeared in 1873. In this work, and in his lectures, Murchison laid great stress upon the etiological distinctions between the different fevers, and exhibited with this view, in a series of tables and diagrams, the weighty statistics. of the London Fever Hospital, which showed, among other points, that as a rule typhus and enteric fever prevail at different seasons of the year. It was, however, not till 1869 that the various forms of L Originally read before the Epidemiological Society of London, April Rth, 1885,