Later writers, for example those who described the great epidemic fever of 1741, have identified the fever of 1685-86 with the contagious malignant fever afterwards called typhus, and Murchison, in his brief retrospect of typhus in Britain, has included it under that name. Sydenham mentions petechiae and livid blotches in some cases, and the Bills give a good many of the deaths in the worst weeks of the epidemic under the head of “spotted fever.” It is not at first easy to understand why Sydenham should have written an essay specially upon it, in September, 1686, to claim it as a new fever[38] and not rather as the old pestilential fever--“populares meos admonens de subingressu novae cujusdam Constitutionis, a qua pendet Febris nova species, a nuper grassantibus multum abludens.” It should be kept in mind that his motive was correct treatment, and that the fashionable treatment of the day by Peruvian bark was, in his judgment, unsuited to this fever, however much it may have suited the epidemical intermittents of 1678-79 and the “depuratory” dregs of them for several years after. Physicians, he says, had learned to drive off by bark the fevers of the former constitution, from 1677 to the beginning of 1685, even when the fever intermitted little and sometimes when it intermitted not at all; and they saw an indication for bark in the nocturnal exacerbations of the new fever. Sydenham found that even large doses of bark did not free the patient from fever, and that restoration to health under treatment with the bark was due “magis fortunato alicui morbi eventu quam corticis viribus.” He seeks to establish the indications for another treatment by setting forth the symptoms minutely; and as the question of bark in fevers was the great medical question of the time, this may well have been Sydenham’s motive for discovering in the epidemic of 1685-6 a “new fever” although he does not say so in as many words. We have a good instance of how the bark-craze was at this time influencing the very highest circles of practice in the case of Lord Keeper Guildford, in July, 1685, as related in another chapter. It will be seen from the table of weekly deaths that the second of the two hard winters was over before the fever began to attract notice. Sydenham compares its beginning after the thaw in February, 1685, to the beginning of the plague when the frost broke in March, 1665.