CHEESE is commonly considered only a relish, but is in reality one of the most condensed forms of nitrogenous food; and a growing knowledge of its value has at last induced the Army Department to add it to the army ration list. Mattieu Williams, after giving the chemical formulas of caseine and the other elements of cheese, writes; "I have good and sufficient reasons for thus specifying the properties of this constituent of food. I regard it as the most important of all that I have to describe in connection with my subject,--The Science of Cookery. It contains, as I shall presently show, more nutritious material than any other food that is ordinarily obtainable, and its cookery is singularly neglected,--practically an unknown art, especially in this country. We commonly eat it raw, although in its raw state it is peculiarly indigestible, and in the only cooked form familiarly known among us here, that of Welsh rabbit or rare-bit, it is too often rendered still more indigestible, though this need not be the case. Cream-cheese is the richest form, but keeps less well than that of milk. Stilton, the finest English brand, is made partly of cream, partly of milk, and so with various other foreign brands, Gruyere, &c. Parmesan is delicately flavored with fine herbs, and retains this flavor almost unaltered by age. Our American cheeses now rank with the best foreign ones, and will grow more and more in favor as their value is understood, this being their strongly nitrogenous character. A cheese of twenty pounds weight contains as much food as a sheep weighing sixty pounds, as it hangs in the butcher's shop. In Dutch and factory cheeses, where the curd has been precipitated by hydrochloric acid, the food value is less than where rennet is used; but even in this case, it is far beyond meat in actual nutritive power." BUTTER is a purely carbonaceous or heat-giving food, being the fatty part of the milk, which rises in cream. It is mentioned in the very earliest history, and the craving for it seems to be universal. Abroad it is eaten without salt; but to keep it well, salt is a necessity, and its absence soon allows the development of a rank and unpleasant odor. In other words, butter without it becomes rancid; and if any particle of whey is allowed to remain in it, the same effect takes place. Perfect butter is golden in color, waxy in consistency, and with a sweetness of odor quite indescribable, yet unmistakable to the trained judge of butter. It possesses the property of absorption of odors in a curious degree; and if shut in a tight closet or a refrigerator with fish, meat, or vegetables of rank or even pronounced smell, exchanges its own delicate aroma for theirs, and reaches us bereft once for all of what is the real charm of perfect butter. For this reason absolute cleanliness and daintiness of vessels containing milk or cream, or used in any way in the manufacture of butter, is one of the first laws of the dairy.