From the fact that only from two to four ounces of nitrogenous food are required to rebuild daily tissue waste, it is apparent that this amount can readily be supplied from the vegetable kingdom, since nuts, legumes, and cereals are rich in proteins; yet there is a question whether a purely vegetable diet is productive of the highest physical and mental development. Natives of tropical climates live on vegetables, fruits, and nuts, and it may be purely accidental, or be due to climatic or other conditions, that these nations have not made the greatest progress. Neither have the Eskimos, who live almost entirely on meat, attained the highest development. The greatest progress and development, both as nations and as individuals, have been made by inhabitants of temperate climates, who have lived on a mixed diet of meat, eggs, milk, grains, vegetables, fruits, and nuts. They have shown more creative force, which means reserve strength. The Eskimo has demonstrated, however, that a diet of meat alone supplies all physical needs; the meat tissue providing growth and repair and the fat supplying all of the carbonaceous elements. The fat, as previously stated, yields more heat than starches and sugars, and Nature provides this heat for climates in which most warmth is required. This may be the reason why natives of warm climates have formed the habit of using vegetables and grains for their heat and energy rather than meat. It is also the natural reason why man in temperate climates eats more meat in winter than in summer. An unperverted, natural instinct will always be found to have a sound physiological basis. For example, if, by reason of some digestive disturbance, one has become emaciated, all of the fat having been consumed, and the cause of the disturbance is removed by an operation or otherwise, one is seized with an almost insatiable desire for fat, often eating large chunks of the fat of meat or large quantities of butter or cream at a meal. When obstructions are removed, Nature makes immediate effort to readjust her forces. Those who object to eating meat should study carefully to learn if the proper proportion of protein is supplied with each day’s rations. The legumes—peas, beans, nuts, and grains—must be supplied. While the wheat kernel contains twelve per cent. of protein, the white flour does not contain as large a percentage and it will be noted by reference to Tables II and III, that the majority of fruits and vegetables contain little nitrogenous substance. Unless the whole of the grain and the legumes form a goodly proportion of the diet the danger is in consuming too large a bulk of waste and too much starch in a purely vegetable diet. In a vegetarian diet, one is liable to eat too freely of cereals; as a result, the liver becomes clogged and torpid and the stomach and intestines are deranged and rendered incapable of full digestion and absorption. The clogged system refuses to assimilate more food.