It is the beginnings of evil that should be guarded against. In the instruction of the youth the effect of apparently small deviations from the right should be made very plain. Let the student be taught the value of a simple, healthful diet in preventing the desire for unnatural stimulants. Let the habit of self-control be early established. Let the youth be impressed with the thought that they are to be masters, and not slaves. Of the kingdom within them God has made them rulers, and they are to exercise their Heaven-appointed kingship. When such instruction is faithfully given, the results will extend far beyond the youth themselves. Influences will reach out that will save thousands of men and women who are on the very brink of ruin. * * * * * [Sidenote: _Diet and Mental Development_] The relation of diet to intellectual development should be given far more attention than it has received. Mental confusion and dulness are often the result of errors in diet. It is frequently urged that, in the selection of food, appetite is a safe guide. If the laws of health had always been obeyed, this would be true. But through wrong habits, continued from generation to generation, appetite has become so perverted that it is constantly craving some hurtful gratification. As a guide it can not now be trusted. [Sidenote: _Nutrient Value of Foods_] In the study of hygiene, students should be taught the nutrient value of different foods. The effect of a concentrated and stimulating diet, also of foods deficient in the elements of nutrition, should be made plain. Tea and coffee, fine-flour bread, pickles, coarse vegetables, candies, condiments, and pastries fail of supplying proper nutriment. Many a student has broken down as the result of using such foods. Many a puny child, incapable of vigorous effort of mind or body, is the victim of an impoverished diet. Grains, fruits, nuts, and vegetables, in proper combination, contain all the elements of nutrition; and when properly prepared, they constitute the diet that best promotes both physical and mental strength. [Sidenote: _Selection; Combination_] There is need to consider not only the properties of the food but its adaptation to the eater. Often food that can be eaten freely by persons engaged in physical labor must be avoided by those whose work is chiefly mental. Attention should be given also to the proper combination of foods. By brain-workers and others of sedentary pursuits, but few kinds should be taken at a meal.