194 



Effectors, 85 



sea-anemone, 89 

 Egg cells, 96, 158 



development, 42 



fertilization, 41, 42 



potency of, 153 

 Ehringsdorf, Germany, 24 

 Elements, chemical, freedom of action 

 in living matter, 100 



chemical, organized in nervous pro- 

 toplasm, 100 



of animal body, 99 



Embryo, circulation, change at birth, 

 60 



condition, at birth, 61 



development in utero, 57 



prenatal conditions, 60 

 Embryonic area, 43 

 Emotion, 146 

 Emotionalism, 163 

 Emotions, 118 

 Endocrine organs, 49, 95 

 Endoderm, 43 



derivatives from, 43 

 Environment and mutations, 156 

 Environment, diverse of man, 132 

 Eoanthropus dawsoni, 19-23 

 Eolithic period, 3 

 Eoliths, 3 

 Epidermis, 56 

 Eugenics, 170 



importance of, 181 

 Eugenists, 148, 182 

 Evolution, and natural selection, 158 



and progress, 127 



direction of, 165 



causes of, 153, 154 



cycles in, 153 



directions of, 159 



drama of, 152 



germ-plasm, 157 



human, tendencies of, 179 



intellectual, 162 



main lines of, 161 



INDEX 



of man, 155, 161, 162 



only an adjustment, 127 



neuromuscular system, 92 



past, causes and directions of, 154- 



165 



progress and retrogression, 127 

 progressive, 183 

 reversal of principle, 166 

 societal, different from that in na- 

 ture, 136 

 Expedition, American Museum, 7, 12, 



37 



Experimentalists, animal, 110 

 Experimentation, animal difficulties of, 



108-110 



Experimentation, in relation to varia- 

 tions, 140 



Extremities, phantasmal, 82 

 Eye, development, 48 

 Eyelid, vestigial, 72 



Face, development of, 56 

 Factors, Darwinian, 130 



individual, 154 

 Female, characteristics of, 96 

 Femur, development, 55 

 Fertilization, 41, 42 

 Feudalism, 136 

 Fishberg, 176 

 Fisher, Irving, 172 

 Fishes, spawning instincts of, 108 

 Fitness, animal, 135 



in natural selection, 158 



societal, 135 

 Flints, Foxhall, 36 



giant of Cromer, 36 



rostro-carinate, 36 

 "Fluctuations," 154 

 Foramen, ovale, 60 

 Fore-brain, 45 

 Forest beds, pre-Glacial, 19 

 Fossil man, Africa, 11 



Asia, 12 



Broken Hill mine, 12 



