Index 
Obesity, 48, 219 
Ova, preservation of, 99 
Ovarian follicle, réle in reproduc- 
tion, 80, 81 
Over-production, 13 
Ovulation, 79 
control of, 80, 100 
effect on menopause, 108 
suppression of, 227 
Ovum, fertilized, control of, 87 
Parentage, emotional aspects of, 287 
Parkes, A. S., 91-99 
Parthenogenesis, 115, 278, 280 
Paternal age, effect of sex ratio of | 
children, 118 
Pavlovian conditioning, 304 
Pearson, Karl, 294 
Penicillin, in gonorrhoea, 198 
Pesticides, dangers of, g—10 
Photosynthesis, rate of, 30 
Physiological diversity, 344-345 
Pigment, loss of, 232 
Pincus, Gregory, 79-90 
Pituitary, rdle in reproduction, 80, 
81 
Planets, colonization of, 15, 30 
Plants, cancer in, 237 
extracts of as contraceptives, 81 
utilization of, 30 
Plato, 330 
Poliomyelitis, eradication of, 201- 
202 
Politics, self-regulation, 158 
use of computers, 162 
use of models as predictors, 161 
Polyandry, 95, 112, 351 
Polygamy, 97, 112, 292 
Polymorphism, 231, 235, 356-357 
Population, densities of, 15, 70, 78, 
139 
in relation to agriculture, 23, 57 
number malnourished, 25, 59, 62 
sex-ratio in, QI, III 
according to age, 92, 93 
control of, 97, 113, 116, 117 
in identical twins, 113 
racial differences, 112 
world, 16, 100 
408 

Population increase, 5, 62, 341 
and communication, 173 
and control of reproduction, 23 
and economic improvement, 32 
and environment, 146 
and food, 42, 62, 78 
and lebensraum, 15 
Malthus on, 31 
problem of, 14 
psychological aspects, 16 
rate of, 70 
Positive feedback, 155 
Power, political, 5 
use of, 318 
Prediction, 328, 329, 337, 362 
Pregnancy rates, 83 
Progesterone, in control of ovulation, 
81, 82 
Proteins, and memory, 313 
animal, 59, 60, 61 
necessity of, 59, 61, 63, 67 
malnutrition, 64, 66 
Protein requirements, 24, 25, 72 
Protein synthesis, 267, 268 
role in embryology, 265 
Psilocybin, 307 
Psychedelics, 12 
Psychopharmacology, 306—309 
Psychosocial pressure, 4, 6 
Ptolemy, 188 
Puberty, age of, 219 
Public-opinion polls, 163 
Quantum phenomena, 239, 240, 242 
Rabies, 202-203 
Race, and social evolution, 130 
Radiation, and astronauts, 355 
effect on lifespan, 219-220 
Radioactivity, 189 
Regulative function, delegation of, 
159 
Religion, 338, 373, 379, 380 
and fear, 17 
in Russia, 129 
relationship with science, 
178, 371, 372; 379 
Renaissance, 188 
167, 
