This is “Bulletin No. 28, Revised Edition,” the work of two of the leading physiological chemists of America, W. O. Atwater and A. P. Bryant; and may be had on sending five cents to the Department. We have inserted in the Appendix a selected list of foodstuffs taken from this publication; and we give here a rough classification of foods, from which one can see at a glance their leading elements: FOODSTUFFS WHICH ARE RICH IN PROTEIDS Eggs White of Egg Skimmed Milk Buttermilk Yogurt Cottage Cheese Nut Products FOODSTUFFS WHICH ARE RICH IN FATS Butter Nut Oils Olive Oil Cream Olives Nuts (except chestnuts) Egg Yolks FOODSTUFFS WHICH ARE RICH IN CARBOHYDRATES Potato Rice Breads Cereal Preparations PURE CARBOHYDRATES Fruits (raw and cooked) Fruit Juices Fruit Jellies Honey Malt Honey Marmalades FOODSTUFFS WHICH ARE RICH IN PROTEIDS AND FATS Nuts Nut Butters Eggs Cheese Nut Products FOODSTUFFS WHICH ARE RICH IN PROTEIDS AND CARBOHYDRATES Peas Beans Lentils Chestnuts Skimmed Milk Gluten Preparations. FOODSTUFFS WHICH CONTAIN ALL THE FOOD ELEMENTS IN FAIRLY GOOD PROPORTION Crackers Batter Breads Pastry Malted Nuts Custards Puddings Salads Sandwiches Soups (other than meat or fish soups). V HOW FOODS POISON THE BODY In our survey of the processes and organs of digestion, we saw that after food has traversed the stomach and small intestine it passes into the colon, where it must remain for some considerable time, while the absorption of its digested elements is completed. And this brings us to the most important of the discoveries of the new hygiene. It has been found that some of the foods which human beings eat are loaded with injurious bacteria, and with the poisons which these bacteria produce. And others of them are indigestible, and when they reach the colon, become a source of incubation for countless billions of other bacteria. It was demonstrated by Metchnikoff that these poisons are absorbed into the system, and are the cause of manifold evils. This is the process which is called “autointoxication.” It would not be regarded as an exaggeration by the leading physiologists of the world to-day to speak of autointoxication as the primary source of nine-tenths of the afflictions from which humanity suffers. Any one would be prepared to admit that the banquet he had attended on the previous night was responsible for the headache which he has on the present morning; but the investigations of bacteriologists have revealed that the food habits of which banquets are typical are responsible for a chronic ailment, of which such diseases as gout, rheumatism, Bright’s disease, consumption, and pneumonia are merely symptoms. THE INVESTIGATIONS OF METCHNIKOFF