Index 
Societies—continued 
sensitivity of units to information, 
163 
Sociology, 168 
Soil fertility, 61, 62 
Somatic mutation, 223, 278 
Soya, 69 
Space travel, breeding men for, 354— 
Spermatozoa, effect of heat, 105 
preservation of, 258, 259, 261, 
276, 278-279, 280 
by freezing, 98 
dangers of, 107 
separation of X and Y, 97, 113 
Sri Krishna, 344 
Staphylococcal infection, 198, 199 
Sterility, 287, 288 
Steroids, and ageing process, 231 
Stillbirths, sex-ratio of, 93 
St. Teresa, 349 
St. Thomas Aquinas, 358 
St. Thomas More, 362 
Subsistence units, 28 
Survival, 250, 317, 318, 319, 320, 
335> 339 
Szent-Gy6rgyi, Albert, 188-195 
Teaching machines, 159, 182, 304 
Technology, and environment, 14.7 
and metropolitan life, 145 
effect on social groups, 123, 169 
explosion of, 170 
Teeth, effect of diet, 47 
Teleology, 245 
Thymus gland, 190 
extract of, causing sterility, 108 
Time, 359 
Tortoises, 237 
Towns, see also Cities 
building of, 139 
importance of, 141 
meeting of different cultures in, 
144 
Tranquillizers, 307 
Translation machines, 162 
Transplantation, 230 
immunology, 267, 277 
of artificial organs, 268 
of organs, 224, 269, 274, 277 
Trémoliéres, 55 
Treviranus, 244 
Truth, 370, 371 
Tuberculosis, among Jews, 212 
drug resistance in, 199-200 
eradication of, 198 
resistance to, 350 
Unemployment, 173 
Universe, integration in, 168 
Valency, 238 
Values, 293, 369-372; 373 
Vasectomy, 106 
Veganism, 54, 55 
Vegetarianism, 54, 55, 71 
Vision, supernormal, 345 
Vitalism, 239-240, 244, 245 
Warfare, 317 
inter-clan, 318 
preserving social equilibrium, 125 
Wave mechanics, 192 
application to biology, 195 
Wheat, calories from, 28, 57 
protein in, 28 
Wilberforce, Samuel, 379 
Williams, Roger, 19 
Woerkom, 10 
Wood, requirements of, 29 
World government, 378 
World population, 100 
World resources, 57 
World state, 7, 338, 340, 378 
Wyndham, John, 340 
X-rays, discovery of, 189 
Yogi, 348 
Youth, extension of, 190 

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