Cheese.
Cheese is a product of milk prepared by separating the casein, with more or less of the cream, according to the manner in which it has been prepared, from the other ingredients of the milk. It is an article, which, although possessing a large proportion, of nutritive material, is very difficult of digestion, and the use of which is very questionable, not only for this reason, but because it is very liable to contain a poison called tyrotoxicon, capable of producing most violent and indeed fatal results, according to the remarkable researches of Prof. Vaughan of Michigan University. This poison is sometimes found in ice cream and custards, cream-puffs, etc., made from stale milk or cream.
It is much better to use milk in its fresh, natural state than in any of its products. Made into either butter or cheese, we lose some of its essential elements, so that what is left is not a perfect food.