Legumes are the seeds of a certain group of plants grown in pods. The term comes from a very ancient word, "legere," meaning _to gather_. Beans and peas are the most familiar types of this group. [Sidenote: Legumes rich in nitrogen] Legumes are rich in nitrogen, and some varieties are also very rich in oil. They are not equal to nuts in fuel or food value, however, because in the natural state they are hard, somewhat indigestible, and unpalatable. These qualities are due to the fact that the nitrogenous material of legumes are radically different from the nitrogen found in nuts, and belong to a class not so desirable as food. Meat may be omitted from the diet and legumes adopted as the chief source of nitrogen, but this change requires some knowledge and careful feeding in the beginning. Meat is digested wholly in the stomach and does not require mastication (only enough to be swallowed), while dried or mature legumes require much mastication, owing to the carbohydrates they contain. The best form in which legumes can be taken is in their green or immature state, owing to the fact that the immature starch they contain is readily soluble, while mature legume starch is rather difficult to digest. FRUITS The term "fruit" in a strictly botanical sense includes a very wide range of vegetable articles--the reproductive product of trees, or other plants, such as grains, legumes, nuts, berries, apples, peaches, plums, etc. In this lesson, however, I will apply the popular meaning to the term. [Sidenote: General composition of fruit] The common succulent or juicy fruits, including both tree fruits and berries, have many properties in common. The chemical composition of these typical fruits consists of from 80 to 85 per cent water, 5 to 15 per cent sugar, 1 to 5 per cent organic or fruit-acids, and small quantities of protein, cellulose, and the numerous salts, a portion of which may be combined with the fruit-acids. Some unripe fruits contain starch and various other carbohydrate substances, many of which are distasteful and unwholesome. On the other hand, when fruits become over-ripe, and decay sets in, the sugar is changed into carbon dioxid, alcohol, and acetic acid, and the fruit rapidly deteriorates in nutritive value and unwholesomeness. These changes, together with the loss of water, account for the sponginess and the tastelessness of cold storage and other long-kept fruits. All varieties of fruit are best when they have been allowed to ripen naturally on the trees, but modern commercial conditions demand that fruits for shipping purposes be picked slightly immature, and allowed to ripen in transit to the markets. [Sidenote: Dietetic value of fruits]