i 9 8 INDEX 



Mate selection, 169 

 Mating, assortative, 169 

 Mauer, Germany, 16 



sands, 16, 17 

 Maupas, theory of, 72 

 McGregor, J. H., 15, 18, 20 

 Mechanism, neuromuscular, 85 

 "Melting pot," 177 



Roman Empire, 180 

 Mendelian combinations, 154, 155, 170 



inheritance, 177 

 Mendelism, 154 



Mental life, various factors which in- 

 fluence, 124 

 Metazoa, 39 



Metchnikoff, theory of, 71 

 Mexico, racial amalgamation in, 176 

 Mesoderm, 43 



derivatives from, 43 

 Mid-brain, 45 

 Miller, G. S., Jr., 20 

 Minot, on differentiation, 161 



theory of, 72 

 Moir, J. Reid, 22 

 Momsen, 179 

 Mores, 137, 138, 139 



and education, 142 



and imitation, 141 



and life conditions, 138 



and sex, 138 



code of behavior, 147 



learned not inherited, 141 



transmitted by tradition, 141 

 Morgan, T. H., 155 

 Morula, 42 



Mousterian industries, 3, 4 

 Mowgli, 109 

 Mulattoes, 176 

 Murals, cavern, 12 

 Muscle, rectus, 76 



sternalis, 76 



subtegumentary, 76 

 Muscles, development, 53 



effectors, 85 



shifting of position, 55 



vestigial, 73 

 Mutations, 154, 155 



and environment, 156 



directions of, 159 



their causes, 156 

 Myelin sheath, 47 

 Myotomes, 44 



"Nams," 168 



Nasal cavity, development of, 57 



Natural law, 147 



Natural sciences, future achievements 



in, 123 

 Natural selection, 135, 158, 178 



elimination of the unfit, 143, 166 

 Naturalists, observations of, 108-110 

 Neandertal man, anatomical features, 

 24 



ideas concerning, 28 



modern representatives of, 28 



skeleton, 23, 24 



skeleton compared with Cro-Magnon 



man, 25 



Neolithic period, 2 

 Neopallium, 46, 93 

 Nerve cells, 46 



development, 49 



evolution, 49 



number in cortex, 93 



see Neurones 

 Nerves, afferent, 48 



motor, 46 



myelin sheath, 47 



sensory, 46 

 Nervous elements, lacking in sponges, 



92 

 Nervous organization, sea-anemones, 



86 

 Nervous system, adjusters, 84, 86 



and organization, 99 



and personality, 81-83 



and sex, 94-99 



