In the fereful tyme of the sweate (ryghte honourable) many resorted vnto me for counseil, among whõe some beinge my frendes & aquaintance, desired me to write vnto them some litle counseil howe to gouerne themselues therin: saiyng also that I should do a greate pleasure to all my frendes and contrimen, if I would deuise at my laisure some thĩg, whiche from tyme to tyme might remaine, wherto men might in such cases haue a recourse & present refuge at all nedes, as thẽ they had none. At whose requeste, at that tyme I wrate diuerse counseiles so shortly as I could for the present necessite, whiche they bothe vsed and dyd geue abrode to many others, & further appoynted in my self to fulfill (for so much as laye in me) the other parte of their honest request for the time to come. The whiche the better to execute and brynge to passe, I spared not to go to all those that sente for me, bothe poore, and riche, day and night. And that not only to do thẽ that ease that I could, & to instructe thẽ for their recouery: but to note also throughly, the cases and circumstaunces of the disease in diuerse persons, and to vnderstande the nature and causes of the same fully, for so much as might be. Therefore as I noted, so I wrate as laisure then serued, and finished one boke in Englishe, onely for Englishe mẽ not lerned, one other in latine for men of lerninge more at large, and generally for the help of thẽ which hereafter should haue nede, either in this or other coũtreis, that they may lerne by our harmes. This I had thoughte to haue set furth before christmas, & to haue geuẽ to your lordshippe at new-yeres (3) tide, but that diuerse other businesses letted me. Neuertheles that which then coulde not be done cometh not now out of season, although it be neuer so simple, so it may do ease hereafter, which as I trust this shal, so for good wil I geue and dedicate it vnto your good Lordshippe, trustyng the same will take this with as good a mind, as I geue it to your honour, whiche our Lorde preserue and graunt long to continue. At London the first of Aprill. 1552. The boke of Jhon Caius against the sweatyng sicknes.