The fats of nuts, their chief food principle, are the most digestible of all forms of fat. Having a low melting point they are far more digestible than most animal fats. Hippocrates noted that the stearin of eels was difficult of digestion. The indigestibility of beef and mutton fat has long been recognized. The fat of nuts much more closely resembles human fat than do fats of the sort mentioned. The importance of this will be appreciated when attention is called to the fact that fats entering the body do not undergo the transformation changes which take place in other foodstuffs; for example, protein in the process of digestion is broken into its ultimate molecular units. Starch is transformed into sugar which serves as fuel to the body, but fats are so slightly modified in the process of digestion and absorption that after reaching the blood and the tissues they are reconstructed into the original form in which they are eaten, that is, beef fat is deposited in the tissues as beef fat without undergoing any chemical change whatever; mutton fat is deposited as mutton fat; lard as pig fat, etc. When the body makes its own fat from starch or sugar, the natural source of this tissue element, the product formed is _sui generis_ and must be better adapted to the body uses than the animal fat which was _sui generis_ to a pig, a sheep or a goat. It is certainly a pleasant thought that one who rounds out his figure with the luscious fatness of nuts may felicitate himself upon the fact that his tissues are participating in the sweetness of the nut rather than the relic of the sty and the shambles. It is also worthy of note that the fat of nuts exists in a finely divided state, and that in the chewing of nuts a fine emulsion is produced so that nut fats enter the stomach in a form best adapted for prompt digestion. Another question which will naturally arise is this: if nuts are to be granted the place of a staple in our list of food supplies will it be safe to accept them as a substitute for flesh foods? Beef steak has become almost a fetish with many people, but the experiments of Chittenden and others have demonstrated that the amount of protein needed by the body daily is so small that it is scarcely possible to arrange a bill of fare to include flesh foods without making the protein intake excessive. This is because the ordinary foodstuffs other than meat contain a sufficient amount of protein to meet the needs of the body. Nuts present their protein in combination with so large a proportion of easily digestible fat that there is comparatively little danger of getting an excess.