Iron, age of, 2 

 Irrationalism, 163 

 "Ishmaels," 168 



Isolation, geographical, lack of, 175 

 racial, 174 



Jacob's cavern, 11 



Jaw, Heidelberg man, 16 



shrinkage of, 75 

 Jews, amalgamation of, 176 

 "Jukes," 168 



Kaa, 109 



"Kalikaks," 168 



Keith, Sir A., 10, 11, 18, 20, 22, 26, 28, 



30, 35, 36 



Krapina, Austria, 24 

 Kultur, 159 



Labor, division of, a mores, 137 

 La Chapelle-aux-Saints, France, 24 

 La Ferrassie, France, 24 

 La Naulette, Belgium, 24 

 La Quina, France, 24 

 Language, 118 



a mores, 137 



advantage of, to man, 118 



as a mores, 141 



man's control over, 120 



responsible for man's superiority, 



120 



Lanugo, 77 



League of Nations, 128 

 Le Moustier, France, 24 

 Life-conditions, 139 

 Life cycle, 70 

 Lightfoot, John, 1 

 Limbs, development, 55 



pentadactyl, 55 

 Liver, development, 50 

 Lungs, development, 49 



Magazine, Natural History, 11 



INDEX 197 



Male, characteristics of, 96 

 Mammalia, Pleistocene, 12 

 Mammals, instincts of, 108 

 Mammary glands, supernumerary, 77 

 Man, ability to accustom to different 

 environments, 133 



American, 40 



and anthropoids, 131 



behavior of, 120 



bodily evolution of, 162 



Caucasian, 40 



controlling his evolution, 166 



dispersal of, 6 



Ethiopian, 40 



evolution of, 155 



fossil, see Fossil man 



Java, see Pithecanthropus, 14 



Malay, 40 



Mongolian, 40 



Mongoloid, 11 



Neandertal, 14 



nervous system of, 84 



nervous system, summary of evolu- 

 tion in, 102 



New World, 11 



normal life cycle, 72 



phylogeny, 36 



Prehistoric, species, 13 



Primitive, language of, 118 



progressive, evolution of, 161-165 



races of, 38, 40 



similarity of, 132 



structural relations, 39 



structural unit of, 39 

 Manipulations, instinctive, 119 

 Mankind, birthplace of, 5 

 Mantle, 46 

 Marriage, 136, 147 



a cultural adjustment, 134 



hindered by modern conditions, 169 



productivity of, 169 

 Marshall, Alfred, 178 

 Mastodon, engraving of, 11 



remains of, 11 



