the Liver and Lungs, which bring on several chronical Diseases, more especially the Dropsy and Asthma; for it is observable, that all overfed Animals have large Livers subject to Putrefaction, and are short winded. I know no exact Way of determining the Quantities of our Food, and of the Changes inducible upon the Body, by the Quantities only, (before Pain and Sickness teach the Exceeding, when perhaps it may be past Remedy) but the Balance, and yet a Man would run the Hazard of being turned into Ridicule, that should gravely talk to People of weighing their Food or their Bodies, at certain Times. The cravings of Nature, and the returns of Appetite are thought to be better Indications for a supply, than the Weight of the Body, and so indeed they would be, if left to themselves; but we eat without Hunger, drink without Thirst, and lie a bed at times unnatural to sleep. I need not add that these are the People that want most the Helps of Medicine. The Quantities of Food, and the unnatural Encrease of the Body may be attended to, without running into ridiculous Extreams of nicety; and after the Rules are once settled, these things may be known without living in a Pair of Scales with _Sanctorius_. I can affirm it from certain Experience, that the keeping the Body to a certain standard of Weight, is a great preservative of Health; and many acute, and chronical Diseases may be foreseen, and prevented by it, and this is known by weighing once or twice a Month with less trouble than paring ones Nails, and regulating the Quantity of Food accordingly; so true is the Aphorism of _Sanctorius_, that if such Kinds, and such Quantities, be daily added to the Body as go off, and the Exceedings discharged, lost Health will be recovered, and present Health preserved.