196 INDEX 



development, 50 



ventricles, 51 

 Height, average of, 69 

 Helix, of ear, 73 

 Hermaphroditism, spurious, 53 

 Hernia, formation of, 53 

 Hind-brain, 45 

 Homo neandertalensis, 23-28 

 Homo (Paleanthropus] heidelbergen- 



sis, 16-19 



Homo primigenius, 23-28 

 Homo rhodesiensis, 28-31 

 Homo sapiens, 18, 31-36, 40 



differentiation, 36 



Grimaldi type, 34 

 Hormones, 50, 96, 157 



effect upon personality, 95 



of interstitial cells, 97 



relation to nervous system, 95 



see Internal secretion 

 Horse, evolution of, 9, 64 

 Hrdlicka, A., 10 

 Human intelligence, 114-122 

 Human race, present conditions and 



tendencies, 165-179 



Humerus, containing supracondylar 

 foramen, 77 



development, 55 

 Humors, 95 



and Hormones, 95 

 Hunter, J., experiment of, 67 

 Huxley, T. H., 131, 156 

 Hybrids, 176 

 Hydrogen, 99, 101 

 Hypophysis, see Pituitary body 



Ideographs, 2 



Implements, Eolithic, 19, 22 

 Indian, North American, 116 

 Indo-China, amalgamation in, 176 

 Industries, Magdalenian, 12 



pre-Crag, 36 



table of, 4 

 Inferences, human, 121 



Inguinal canal, 53 

 Inheritance, and variation, 153-156 

 social, 142, 157 



factors and mental capacity, 171 



germinal, 157 

 Instinct and reason, 105 

 Instinctive, actions, theory of the 

 origin of, 107 



manipulations, 119 

 Instincts, 106, 111 



animal, 108 



biological utility of, 106 



hereditary, 106 



Institutions, human, rise of, 138 

 Intellect, development of, 153 

 Intellectual power and cultural sur- 

 roundings, 116 

 Intelligence, 122, 166 



and consciousness, 112-114 



and relation to nervous system, 119 



animal, 104-112 



evolutionary processes of, 112 



frog, 111 



function of nervous system, 104 



future development of, 122-125 



guinea pig, 111 



human, 114-122 



individual, field of, 119 



prehistoric man, 114 



primates, 111 



rudimentary power of, 112 



variation in human races, 115 

 Interest and emotion, 146 

 Intermarriage, 170 



Internal secretion, development of 

 organs, 49 



influence of puberty, 69 



see Hormones 

 Interstitial cells, 97 

 Intestine, appendix of, 73, 74 



caecum of, 73, 74 

 Intussusception, 63 

 Invention, an adjustment, 134 

 Inventions, great progress in, 164 



