How Nuts should be Used. Another form of fat is the "meat" of different nuts--walnuts, pecans, almonds, etc. These are quite rich in fats, and also contain a fair amount of proteins, and are, in small quantities, like other fats, appetizing and useful articles of food. But they should not be depended upon to furnish more than a small amount of the whole food supply, or even of its necessary fat, because nearly all nuts contain pungent or bitter aromatic oils and ferments, which give them their flavors, but which are likely to upset the digestion. This is particularly true of the peanut, which is not a true nut at all, but is, as its name indicates, a kind of pea grown underground. Peanuts, on account of their large amount of these irritating substances, are among the most indigestible and undesirable articles of diet in common use. A certain amount of these irritating substances present in nuts may be destroyed by careful roasting and salting; but this must be most carefully done, and it shrinks them in bulk so that the finished product is far more expensive than butter or fat meat of the same nutritive value. Good salted almonds, for instance, cost fifty to eighty cents a pound. The proper place for nuts is where they usually come on our tables--at the end of a meal. Those who attempt to cure themselves of dyspepsia by a nut diet are simply making permanent their disease. FOOTNOTES: [9] Pemmican is a sort of "canned beef" made originally out of the best parts of venison and buffalo-meat. This is boiled, and packed into skin bags; then melted fat is poured in, so as to fill up all the chinks and form a thick layer over the surface. It is now made of beef packed in canvas bags, and is much used by polar expeditions and Alaskan miners. CHAPTER VII KINDLING AND PAPER FOODS--FRUITS AND VEGETABLES The Special Uses of Fruits and Vegetables. We come now to the very much larger but much less important class of foods--the Kindling foods, which help the Coal foods to burn, and supply certain stuffs and elements which the body needs and which the coal foods do not contain. These are the vegetables--other than potatoes and dried peas and beans--and fruits. Fruits and vegetables contain certain mineral elements, which are not present in sufficient proportions in the meats, starches, and fats. Furthermore, the products of their digestion and burning in the body help to neutralize, or render harmless, the waste products from meats, starches, and fats. Thirdly, they have a very beneficial effect upon the blood, the kidneys, and the skin. In fact, the reputation of fruits and fresh vegetables for "purifying the blood" and "clearing the complexion" is really well deserved. The keenness of our liking for fruit at all times, and our special longing for greens and sour things in the spring, after their scarcity in our diet all winter, is a true sign of their wholesomeness.