INDEX 



609 



Life .definition of, 3 



expectation of, 356-^59 



geneological tree of, 54 



in cities, 348 



in various geological epochs, 5$, 56 



light requirements, 6 



on known astronomical bodies, 

 10-24 



oxygen requirement, 7 



"reflex," 250 



synthetic processes in, 37 



temperature requirements, 5 

 Light, in urban and rural environ- 

 ment, 371 



necessary for life, 6 

 Living matter, constituents of, 4 

 Locomotor apparatus, origin of, 65-71 



reflexes of, 255 

 Longevity, 508-509 

 Lungs, 221 

 Lymph, inorganic composition of, 48 



Magnesiumj increasing in ocean, 49 

 Malaria, 436 

 Malignant disease, 447 

 Mammals, age of, 55 



contrasted with reptiles, 72 

 Mammary glands, origin of, 72 

 Man, age of, 55-57 



citizen of phylum chordata, 57-63 



color of skin, 160 



emerges on the ground, 83-89 



influenced by food, 331-347 



instabihty, 160 



nascent races, 158 



origin of, 35-5 1 



origin of races, 157 



race characters, 159 



races of, 156-183 



societies biologically considered, 

 150 



species of, 156 

 Marriage, and promiscuity, 271 



and sex ratio, 276-278 



as integration of the sexes, 266-290 



as regulator of sex Hfe, 272-275 



contract, 281 



divorce, 288-290 

 Marriage, economic control of, 283- 

 288 



effect of period of infancy, 280, 281 



effective early, 273-275 



forms of, 268-271 



Marriage, of cousins, 283 



of the future, 290 



possible biological control of, 275 



spontaneous attractions and aver- 

 sions, 282 

 Mars, 12, 13 



canals, 19 



possibility of life on, 16-24 

 Medicine, industrial, 456 



influence on the race, 428-457 



knowledge of causes of disease, 

 413-441 



orthodox and irregular, 442 



preventive, 453-456 



prognosis, 437 



specialism in, 431 



tropical, 435-437 

 Melanesians, 170 

 Memory, as factor in evolution, 128 



nervous center of, 262 

 Mendel, on inheritance, 500-502 

 Mendelian laws, 555 

 Mental defect and crime, 395-398 

 Mental disease, and crime, 398 



and insanity, 451 

 Mental energy and temperature, 

 302, 304 



other climatic factors, 327 

 Mentality, development of, 115, 116 

 Mercury, rotation of, 7 



temperature of, 14 

 Mesozoic, 55 



Metabolism and temperature, 312 

 Microscopic visability, 196 

 Milk, purification of, 370 

 Mind, centers of, 259-263 



evolution and primates, 11 5-1 37 

 Mingling of races, 553-565 



Dutch-East Indians, 563 



Eurasians, 563 



fundamentals in, 553 



heterosis (hybrid vigor), 554 



Indian-European crosses, 560 



Hottentot-Dutch crosses, 561 



Negro-White crosses, 561 



Philippinos, 563 



Polynesian hybrids, 562 



Scandinavian-Lapp, 564 

 Missouri crime survey, 385 

 Mitochondria, 193 

 Mixture of races, 176-178 

 Monkeys, see primates 

 Monogamy, 269-271 



