A dissertation on milk : In which an attempt is made to ascertain its natural use; to investigate experimentally its general nature and properties; and to explain its effects in the cure of various diseases: likewise to point out the varieties in the food of the animal, from which it is taken; and the circumstances in the mode of life and conduct of those women, who afford it, which more especially tend to change its appearance, and to impair its salutary qualities: and particularly to enforce the cautions and restrictions, which are necessary to be observed by those, whose duty or business it is to suckle an infact race. By Samuel Ferris, M.D. extraordinary member, and late president of the Royal Medical Society, at Edinburgh.