566 



INDEX 



Sensitiveness, 18, 135, 148 



Sensory nerve-cell, 153; nerves, 

 l->4 



Services of supply to cells, 82 



Sex, 324; determination of, 313 

 (fig.), 366; differentiation of, 

 327; cells, 297; chromosomes, 

 366, 513; linkage, 375; organs, 

 328; organs, accessory, 298 



Sexiuil characters, secondary, 308; 

 reproduction, 116, 297, 316, 322, 

 324; selection, 426 



Shore plants, distribution of, 484 



Sibs, 519 



Sight, 136, 144; in relation to 

 touch, 146 



Simple reflexes in man, 531 



Skeletal muscles, 125 



Skin, color of, 507, 510 (fig.) 



Slavs, 527 



Sleep, simimer, 250; winter, 99, 

 249 



Sleeping sickness, 237 



Sinall-pox, 233 



Smell, 142 



Smooth mascles, 125 



Smuts, 210 



Social clas-ses, 522 



Soil, 204; bacteria, 275: cultiva- 

 tion of, 535; exhaustion of, 271; 

 fertility of, 109; ingredients, 38 



Souring of milk, 264 



South Itiilian race, 527 



SiKM-ialization, 283 



Species, 412 



SiK-ctnim, 39 (fig.) 



Speed in horses, inheritance of, 

 402 



Spenn, 29, 298 (fig.), 325; mother 



cell, 310, :i:V) 



Spindle, nuclear, 288 (fig.) 

 SpinH'hetes, 219; disease due to, 



225 

 Splitting of chromosomes, 288 

 Sfxmtaneous generation, 292 

 S|K)rangium, .'i32 

 Spore, .'i30; large, 333; production 



in fem.s, 331; resting, 117, 318; 



small, 332 

 S|K)mphyte, 330 

 Spwrts, 552 

 Starch, 44, 64, 92 

 Stati.Htical method, 516 

 Stature, human, 512 



Stems, adjustment of, 112; struc- 

 ture of, 56 (fig.) 



Sterilization, 527 



Stimulation, 19, 135 



Stimuli, 18, 110, 117 



Stomach, 96 



Stomata, 58 (fig.) 



Storage, 63, 345 



Strength of muscles, 131 



Strife impulse, 551 



Structure of cells, 20 (fig.) ; of ferns, 

 330 (fig.); of leaves, 58 (fig.); of 

 muscle fiber, 126 (fig.); of nerv- 

 ous system, 152 (fig.); of para- 

 sites, 201; of roots, 53 (fig.); of 

 stems, 56 (fig.) 



Struggle for existence, 423 



Subdivisions of realms, animal, 

 480; plant, 456 



Sub-species, 413; of modem man, 

 503 



Success, commercial, 552 



Sugar, 40, 92; cane, 96; in fermen- 

 tation, 262; malt, 94, 262; milk, 

 96,264 



Sulphur bacteria, 273; cycle, 279 



Summer sleep, 250 



Supplementary genes, 386, 398 



Supply, services of, to cells, 82 



Surface, body, 84; cell, 84, 283 



Survival of the fittest, 425 



Swamps, 470 



Swarm spores, 322 



Swallowing, 96, 133 



Swingle, Dr. W. T., 395 



Symbiosis, 7, m\ (fig.), 218, 275 



Symptoms of disease, 180 



Synapsis, 354 



Syndactyly, 509 (fig.) 



Synthesis of proteins, 46 



System, colloidal, 49; flatworm 

 transportation, 85 (fig.); nervous, 

 110, 148 (fig.); tracheal of 

 insects, 101 (fig.); motlerately 

 complex transportation, 86 



Systems, tissues and organs, 32 

 * 



Tangible barriers, 453, 474 



Tannin, 209 



Tapeworm, 200 (fig.) 



Taste, 141 



Taxonomy, 4, 411 



T<H»th, ulcerated, 222 



Telegraph, 548 



