“Autumnal intermittents do not at once assume the genuine type, but in all respects so imitate continued fevers that unless you examine the two respectively with the closest scrutiny, they cannot be distinguished. But, when by degrees the impetus of the ‘constitution’ is repelled and its strength reined in, the fevers change into a regular type; and as autumn goes out, they openly confess themselves, by casting their slough (_larva abjecta_) to be the intermittents that they really were from the first, whether quartans or tertians. If we do not attend to this diligently” etc. And again, in a paragraph which does not occur in the earlier editions, he writes as follows in the context of the “Intermittent Fevers of the years 1661-1664:” “It is also to be noted that in the beginning of intermittent fevers, especially those that are epidemic in autumn, it is not altogether easy to distinguish the type correctly within the first few days of their accession, since they arise at first with continued fever superadded. Nor is it always easy, unless you are intent upon it, to detect anything else than a slight remission of the disease, which, however, declines by degrees into a perfect intermission, with its type (third-day or fourth-day) corresponding fitly to the season of the year.” The intermittent character of these fevers seems to have struck Sydenham himself in a later work as forced and unreal. Writing in 1680, when the same kind of fevers were prevalent, after the epidemic agues of 1678 and 1679, he calls them “depuratory,” and says that “doubtless those depuratory fevers which reigned in 1661-64 were as if the dregs of the intermittents which raged sometime before during a series of years,” i.e. the agues of 1657-59[18]. Theory or names apart, Sydenham’s account of the fatal epidemic fever of the summer and autumn of 1661, comes to nearly the same as Willis’s. Without saying expressly, as Willis does, that the victims were mostly children or young people, he speaks in one place of those of more mature years lying much longer in the fever, even to three months, and he specially mentions the same sequelae of the fever in children that Willis mentions, and that Roger North remembered in his own case--namely that they sometimes became hectic, with bellies distended and hard, and often acquired a cough and other consumptive symptoms, “which clearly put one in mind of rickets.” He refers also to pain and swelling of the tonsils and to difficulty of swallowing, which, if followed by hoarseness, hollow eyes, and the _facies Hippocratica_, portended speedy death. Among the numerous other _accidentia_ of the fever, was a certain kind of mania. Among the symptoms were phrensy, and coma-vigil; diarrhœa occurred in some owing, as he thought, to the omission of an emetic at the outset; hiccup and bleeding at the nose were occasional.