554 



INDEX 



57-58; wail of, 52, 58; work of all, 

 162 



Cellulose, of plant cells, 52 



Central nervous system, divisions of, 

 205; functions of, 206-210; protec- 

 tion of, 205-206 



Centrosome, function of, 59 ; in cell 

 division, 61-62 



Cephalopoda, 523 



Cercopithecidae, 527 



Cerebellum, function of, 207 ; level of 

 reaction in, 218, 219, 220 ; nature of, 

 207 



Cerebro-spinal nervous system. See 

 Central nervous system 



Cerebrum, function of, 206-207; level 

 of reaction in, 218, 220 ; nature of, 

 206 ; position of, 207 ; size in various 

 animals, 207 ; structure of, 206 



Cetacea, animals of Order, 527 



Chaetopoda, 523 



Chambers, Prof. R. H., dissections under 

 microscope by, 23, 45 ; on heredity, 55 



Chance, law of, laboratory problem to 

 demonstrate, 317 



Character, dominant, 324, 333; of off- 

 spring, 306-317 ; recessive, 325, 333 



Character-determiners, in chromosomes, 

 55, 319 



Characters, acquired, 336-337; domi- 

 nant, 324, 333; inherited, 336; 318- 

 333 ; law of unit, 327-333 ; recessive, 

 325, 333 ; secondary sexual, 281-282 



Chemistry, and its relation to biology, 16 



Chemotropism, shown by amoeba, 46. 

 See Tropisms 



Chicken pox, effects of, 478 ; method of 

 spread, 478 



Child-labor laws and eugenics, 366-367 



Chiroptera, animals of Order, 527 



Chlorophyll, in plants, function of, 36-37, 

 39,59 



Chloroplasts, first seen, 28 ; function of, 

 59 ; structure of, 28 



Chordata, classified, 525-527; meaning 

 of, 525 



Chromatin granules, function of, 57 ; 

 structure of, 55 



Chromosome, changes in number, 339 ; 

 number in sex cells, 270-271 



Chromosome theory, of inheritance, 331- 

 333 



Chromosomes, 55 ; behavior in cell 

 division, 62 ; behavior in maturation, 

 268-269, 284, 316 ; continuity of, 306, 

 307 ; laboratory problem to show 

 chance combinations of genes in, 317 ; 

 laboratory problem to show possible 

 combination of genes in, 326-327 ; lo- 

 cation of genes in fruit fly, 312 ; locus 

 of genes, 331 ; number in sex cells and 



body cells of various animals, 307 ; 

 270-271 ; relation to heredity, 315- 

 317, 324-326, 331-333 



Chronological age, 229 



Chyme, 129 



Cilia, in Paramecium, 48, 49, 50 ; in 

 respiratory tract, 75, 179 



Circulation, of blood, 143 ; coronary, 

 154 ; early investigations of the, 163 

 165 ; effect of violent emotions on, 

 167 ; necessity of, 149-150 ; organs of, 

 153-154 ; portal, 160-161 ; pulmo- 

 nary, 160; systemic, 159-160; time 

 for complete, 161. See Blood 



Circulatory system, 151-162 ; diagram 

 of, 155 ; functions of, 168 ; hygiene of, 

 167-169 



Classification, basis of, 512-514; diffi- 

 culties in, 511-514 ; evolution in, 517- 

 518 ; geographical distribution and, 

 573; habits and, 513-514; Interna- 

 tional Commission on, 514-515 ; mor- 

 phology in, 513 ; of plants and animals, 

 518-527 ; present method of, 515-518 



Cloaca, in frog, 115 



Close-breeding, reasons for and results 

 of, 353-354 



Clotting of blood, 148 



Cocci, form of bacteria, 392 



Coelenterata, classified, 521-522 ; mean- 

 ing of, 521 



Cohnheim, J., experiment on transmis- 

 sion of tuberculosis, 438 



Cold, a common disease, causes of, 473- 

 475 ; chronic, 474 ; effects on body, 

 473-474 ; predisposing factors, 474 ; 

 prevention of, 475-476 ; remedial meas- 

 ures, 476 ; transmission of, 474-475 



Collip, experiment with parathyroid ex- 

 tracts, 196 



Conjugation, 264; of Paramecium, 49- 

 50, 267-268 



Connective tissue, 81-82 



Conservation, of soil, 411 



Constipation, causes of, 139 ; prevention 

 of, 139, 140 



Continuity, of germ plasm, 336 



Contractile tissue, 83 



Contractile vacuole, of amoeba, 42 ; oi 

 Paramecium, 47 



Corolla, of flower, function of, 274 



Coronary circulation, 154 



Corpuscles, white, description of, 88 : 

 functions of, 88, 147-148; in infec- 

 tion, 148; number of, 88, 147; red, 

 destruction of, 146 ; formation of, 

 146 ; function of, 88, 146 ; number of, 

 88, 147 ; size of, 88 ; structure of, 88 



Cortex, of brain, areas of, 206-207, 213 ; 

 functions of, 207, 213 ; structure of, 206 



Cotyledons, 278-279 



