Enjoyment of food, desirability of, 46-47, 201-202. Enthusiasm in exercise, 95-96. Equanimity, secret of, 115. Ether, habit of using, as a stimulant, 242. Eugenics, importance of, 157; distinction between other branches of hygiene and, 157; aim of, 163-165; implies right care of racial germ-plasm, 165; and wisdom of choice in marriage, 165-166; ability of science of, to guide race to higher levels, 166-167; knowledge of, both a personal advantage and a social necessity, 167; main features of thoroughgoing program of, 167; importance for future generations, 167; grandest service of science to the human race, 167-168; a remedy for degenerative tendencies, 292; scope of, 293; correction of popular misconceptions, 293-294; discovery of hereditary laws, resulting in science of, 294-295; rules of, 296; instances of improvement from application of principles, 319-322; three main lines of eugenic improvement, 323; need of State Eugenic Boards, 323-324; references on, 324. Exercise, times for taking, and benefits, 16; necessity for, to offset evils of a sedentary life, 94; different forms of, 94; after eating, 94; outdoor, in winter, 95; question of enthusiasm in, 95-96; ideals in, 96; of mind, will and emotions, 97-98; dancing as, 99-100; for overweight, 217; for underweight, 220. Exercises, breathing, 25-26; breathing, for correcting evils of bad posture, 58; corrective, for faulty posture, 62, 221-223; for flat foot, 223. Expectations of life, comparison of, in different localities, 290. Eye-strain, evils resulting from, 93; preventive measures, 93-94; remote effects of, 122. Fads, avoidance of, in matter of diet, 50. Fans for keeping air in motion, 10. Fat, function of, as a constituent of food, 35-36; examples of, in common foods, 36; suitable proportion of, in diet, 40; as laxative food, 52; in cheap foods, 131; list of foods poor and rich in, 171; fat-forming food to avoid in cases of overweight, 216; forms of, for underweight, 220. Fatigue, cautions regarding eating in a state of, 35; relation of posture to, 57; connection between colds and, 70, 276; relaxation a remedy for, 101; value of baths, for, 102; avoidance of, in cases of underweight, 220. Feet, misdirected, 59-60; correct position of, in standing and walking, 60; exercises for the, 223; disturbances of health due to weak, 224; means of detecting weak, 224-225. Figs, laxative quality of, 52; food value of, 179. Fires, ventilation by wood or grate, 10. Fish, a high-protein food, 38; special objections to an abundance of, 39. Fisher, George J., smoking tests conducted by, 259-260.