4. Cheerfulness is an important aid to digestion. The mind should be free from care, and the surroundings pleasant. 5. Avoid overeating. 6. There should be between five and six hours' interval between meals, and no food should be taken during this interval. 7. Make your list of foods balance up with about ten per cent protein, twenty-five to thirty per cent fat, and sixty to sixty-five per cent carbohydrate. 8. Eat few kinds of food at a meal, but vary the menu from day to day. 9. Food should be properly cooked to get the best results. 10. Do not eat late at night. The evening meal should be the lightest. 11. Eat green vegetables frequently in season. 12. Fresh fruits are very helpful in the diet. 13. Combine fruits, grains, and nuts. 14. Fruits and coarse vegetables are not a good combination. 15. It is better not to take large quantities of cane sugar and milk together. 16. Do not eat rich and complicated mixtures of food. 17. Flesh meats are expensive, they make the protein high, and are second-hand foods. Their place may easily be supplied by other foods. 18. Avoid excessive amounts of salt. 19. Do not use pepper or other irritating condiments and spices in seasoning your food. 20. Tea and coffee are not foods, and should be entirely dispensed with. 21. Alcohol is a poison, and should be entirely eliminated from the menu. [Illustration] Necessary Knowledge to Careful Planning To thousands of home-keepers the requirements are new: a correct knowledge of proteids, of carbohydrates, of calories is unfamiliar to them. They cannot grasp what is asked of them, in a day or a week or a month. Suddenly has housekeeping been transformed from a daily round to a science and a business.... It all calls for intelligent study and the most careful planning. It is not a small "bit," it is a full-sized job: never has the American woman faced a bigger job. As she does it or fails of doing it, will this great country win or lose the war.--_Ladies' Home Journal._ [Illustration] VITAMINES _and_ CALORIES _by_ _D. D. COMSTOCK, M.D._ for years Medical Superintendent of Glendale Sanitarium, Glendale, California The body is a machine, intricate, complicated, "fearfully and wonderfully" constructed. In one way, it is simple in its operations; but in another, so ultrascientific in the detail of its automatic control, and so deep in the mysteries of its chemical processes, that the investigation of ages has not been able to fathom its greater scientific depths, and bring to the surface a knowledge of its ultimate structure and its wonderful workings. The Master Designer of the living machine so adjusted its mechanism that in its original environment and relationship, its care would be easy, and the laws of its preservation few and exceedingly simple.