Thou ought to knowe that clere renynge waters that ben nyght to cytees in pure grounde as small brokes be the best and lyghtest. Water that cometh out of stony erthe where as is moche fumosytees is hevy, contagyous, & noysom. Water of puddles or fenne full of frogges, addres, and other venymous wormes be unholsom. The sygnes of good water is to be clere, lyght, & of good colour, that lyghtly dooth sethe and lyghtly coole. In suche waters nature delyteth. Salt water of the see is fumysshe and laxeth the wombe, & water of the see is hote and hevy bycause is moeveth not, & the sonne is dayly over it, and it bredeth coler, and creaseth the mylt and the lunges. The drynkynge of waters with a colde stomake fastynge afore dyner greveth the body, and quencheth the heate of the stomake. But drynkynge of water after dyner warmeth the stomake and bredeth flewme. And moche of it corrupteth the meate in the stomake. Thou oughtest to drynke colde water in somer and warme water in wynter, and not contrary wyse. For warme water in somer mollyfyeth and weyketh the stomake, and wasteth the appetyte. And in wynter colde water quencheth the heate, and destroyeth the instrumentes of the brest, it noyeth the lyghtes and lunges and bredeth many greves.