"The Boke of Jhon Caius aganst the sweatyng Sickness" is an interesting document. It opens with a long autobiographical passage as to his previous literary labours, which have ranged from medicine to theology. At first he wrote in English, but afterwards in Latin and Greek. The reason for this change is stated. "Sence y{t} that tyme diverse other thynges I have written, but with the entente never more to write in the Englishe tongue partly because the comodite of that which is so written, passeth not the compasse of Englande, but remaineth enclosed within the seas, and partly because I thought that labours so taken should be halfe lost among them which set not by learnyng. Thirdly, for that I thought it best to auoide the judgment of the multitude from whom in maters of lernyng a man shal be forced to dissente, in disprouyng that which they most approue, and approuyng that which they most disalowe. Fourthly for that the common settyng furthe and printig of every foolishe thyng in englishe, both of phisicke vnperfectly and other matters vndiscretly diminishe the grace of thynges learned set furth in thesame. But chiefely because I would geve none example or comfort to my countrie men (who I would to be now, as here tofore they have been, comparable in learnyng to men of other countries) to stande onely in the Englishe tongue, but to leaue the simplicitie of the same, and to procede further in many and diuerse knowledges both in tongues and sciences at home and in uniuersities, to the adornyng of the comon welthe, better service of their kyng, and great pleasure and commodite of their own selues, to what kind of life so euer they should applie them." But his resolution not to write again in the vulgar tongue was broken by considerations of utility, for he saw that it could not be very serviceable to ordinary English people to give them advice as to the treatment of the sweating sickness in a language which they did not understand. In his account of this dire malady, he lays stress upon errors and excess of diet as a strongly co-operating cause. "They which had thys sweat sore with perille or death, were either men of welthe, ease and welfare, or of the poorer sorte such as wer idls persones, good ale drinkers, and Tauerne haunters. For these, by ye great welfare of the one sorte, and large drinkyng of thother, heped up in their bodies moche evill matter: by their ease and idlenes, coulde not waste and consume it." Against the infection of bad air he recommends avoiding carrion "kepyng Canelles cleane" and other general sanitary precautions. He suggests that the midsummer bonfires were intended for purging the air, "and not onely for vigils." Rosewater and other perfumes are to be used, and he thinks it would be well to clear the house of its rushes and dust. It is to be feared that the rushes which served instead of carpets, even in great houses, were not renewed very frequently. The handkerchief was to be