INDEX 



565 



tion of, 208 ; level of reactions of, 218, 

 219, 220; relation to reflexes, 208; 

 structure of, 207-208 



Spireme, formation of, in cell division, 

 61-62 



Spirilla, form of bacteria, 392 



Spirochaete, causative organism of yel- 

 low fever, 492 



Spirogyra, description of, 31 ; labora- 

 tory problem on the cells of, 31-33 ; 

 meaning of, 32 ; reproduction of, 247- 

 248 ; 265-267 ; specialized structures 

 of, 32; typical green cell, 31-37 



Spleen, activity of, 200 ; location of, 200 



Split-proteins, poisonous, formation of, 

 495 



Sponges, use of bacteria in preparation 

 of, 404 



Spontaneous generation, controversy on, 

 242-244 ; experimental evidence on, 

 239-241 ; 242-243 ; theory of, 239 



Sporangia, laboratory problem, in vari- 

 ous molds, 252 



Spore, of bacteria, denned, 395 



Spore-formation, cause of, 250 ; of yeast 

 cells, 250 ; reproduction by, 250 



Sport. See Mutants 



Sporozoa, 521 



Stanford Revision of Binet-Simon scale, 

 228 



Starch, digestion of, 130 



Steapsin, 131 



Stentor, regeneration of, 56 



Stomach, function of, 129 ; glands of, 

 125-126; of frog, 115; parts of, 152; 

 shape of, 129 ; valves of, 125 



Stomata, of leaf, 67, 69 ; guard cells of, 

 67 ; position of, 67 



Storage, of food in plants, 70-71 



Structure, of amoeba, 42 ; of Paramecium, 

 46-47 ; of cell, 53-55 ; of protoplasm, 

 55-57; of higher plants, 66-72 



Struggle for existence, 373 



Stimulation, of glands, chemical, 121, 

 128; mechanical, 121; psychical, 121, 

 127 



Stimulus, meaning of, 40 ; of glands. 

 See Stimulation 



Stylonychia, regeneration of, 56 



Sublingual gland, in mouth, 121 



Submaxillary glands, in mouth, 121 



Succus entericus, 131, 132 



Sunlight, in relation to rickets, 103 



Supporting tissues, in man, 77 ; in 

 plants, 71 ; laboratory problem on, 

 80 



Surgery, antiseptic, 4 ; aseptic, 45 ; 

 early, 3, 11-13; grafting in. 259-260 

 modern methods in, 13-15 



Survival of the fittest, 374 



Sweat glands, 171, 173 



Sweet peas, Mendel's experiments in 



heredity of, 322-326 ; 327-330 

 Symbiosis, denned, 394 

 Sympathetic nervous system. See Au- 



tonomic nervous system 

 Synapse, properties of, 208, 209, 210 

 System, circulatory, 151-162; diagram 

 of circulation, 155 ; nervous system, 

 202-214 ; lymphatic, 163-169 

 System development in embryo, 286 

 Systema Naturae (Linnaeus), 511 

 Systemic circulation, of blood, 159-160 



Table, of caloric needs, 105 ; of foods 

 containing minerals, 96 ; of food 

 nutrients, 94 ; of vitamins, 101 



Tartar, on teeth, 109 



Taste-buds, importance of, 120 



Taxonomy, meaning of, 512 ; difficulties, 

 513-514 



Teeth, arrangement of, 108-109 ; causes 

 of decay, 109-112; causes of mal- 

 formation, 180; dental care, 110- 

 111; kinds of, 107-108; individual 

 care of, 109-1 1 1 ; laboratory problem 

 on condition of teeth, 112 ; number of, 

 107-108 ; of adults, 108 ; of children, 

 108, 109 ; relation of diet to, 111-112 ; 

 structure of, 107, 108 ; tartar on, 109 



Telophase, stage in cell division, 63 



Temper, bad effect of, 236 ; reason for, 

 235-236 



Terman, revision of Binet-Simon scale 

 by, 228 



Tendons, use of, 81 



Tetanus, antitoxin, 461 ; bacilli, 460 ; 

 cause of, 459-460; discovery of bacil- 

 lus of, 460 ; entrance into body, 460 ; 

 nature of. 461 ; occurrence, 460 ; 

 prevalence, 459 ; prevention, 462 ; 

 treatment, 461 



Tetany, cause of, 196 



Thallophyta, classified, 518-519; mean- 

 ing of, 33 ; plants of, 33 



Thermotropism, shown by amoeba, 46 



Thigmotropism, shown by amoeba, 46 



Thoracic duct, 165 



Thymus gland, location of, 199 ; relation 

 to growth, 199 



Thyroid gland, disturbances of secretion, 

 194-195; grafting of, 193-194; in- 

 fluence on growth, 194 ; position of, 

 192-193 ; secretion of, 193. See also 

 Cretinism, Cretins, Goiter, Myxodema 



Thyroxin, secretion of thyroid, 194 



Tidal air, 183 



Tissue, blood, 87, 145-148 ; contractile, 

 83 ; use of epithelial, 75-77 ; functions 

 of, 88-89; muscular, 85; nerve, 86- 

 87 ; of leaf, 68-69 



Tissue fluid, 165 



