The “Putrid Constitution” of Fevers in the middle third of the 18th Century. Resuming the history of fevers among the people at large from the great typhus epidemic of 1741-42 to the end of the century, we find the conditions somewhat different in the earlier and later divisions of the period. The time of prosperity, when England exported large quantities of wheat in every year except two or three, is reckoned from 1715 to 1765; after the latter date England gradually ceased to be an exporting country, owing to various causes, including the increase of pasture farming and the growth of industrial populations in the northern counties. The year 1765 marks the beginning of what has been called the Industrial Revolution; and it is also an important point of time in the history of the fevers of the country, for it is in the generation after that we obtain all the best information on what may be called industrial typhus, in the writings of a group of physicians who were at once philanthropic and exact. But there was an earlier period of fever, which is somewhat difficult to the historian. It is perhaps the last period in which Sydenham’s language of “epidemic constitutions” seems to be appropriate, whether it be that the writers of the time were still under his influence, or because the prevalent maladies could not well be accounted for in any other way. The constitution in question was a “putrid” one. It coincided with the great outburst of putrid or gangrenous sore-throat, to be described elsewhere; and it included an extensive prevalence of fevers which were also called putrid or nervous, and sometimes called miliary. Fevers of the same kind, and with the same miliary rash, are described by earlier writers, such as Huxham. Perhaps the most correct view of the matter is to consider this type of fever as corresponding roughly to the middle third of the century, and as having been interrupted by the typhus epidemic of 1741-42, during a time of special distress. Besides the great outburst of putrid or malignant sore-throat, there was also a disastrous murrain of cattle for several years; and at Rouen there was a remarkable fever which some English writers of the time took to be the highest manifestation of the same “putrid” constitution that they discovered also in the English and Irish fevers.