Whey is a delightful beverage; but as its nature and operation cannot be well understood until the composition of milk is investigated, the observations which I have to offer upon its use will be deferred until the history of that fluid has been examined.

249. The nature of weak broths, and the manner in which they are decomposed in the digestive organs, have been already considered (97); and I shall have occasion to revert to the subject in a future part of the work.

250. There are certain saline solutions which are frequently employed as drinks, and deserve some attention in this place: such are imperial and soda water.