INDEX 



IX 



Rest, 369 f. 



Resuscitation, lyoff. 



Rexford food table, 149 



Rheumatism, 304 



Rickets, or rachitis, 304 



Ringworm, 335, 431 



Rockweed, 472 



Root hairs, 114, 116, 128 



Roots. 13. 67, 113; forms of, ii4f. ; 

 structure of, 1 1 5 f- ; uses of, 1 16 ff. ; 

 as binding agents, ii6f. ; adventi- 

 tious, 118; cHmbing, 118; prop, 

 118 f. 



Rose, economic value of, 439 



Rotation of crops, 570 



Roundworms, 81, 332 



Rue, economic value of, 440 



Safety, hints for, 371 ff. 



Sa Wva, 131 



Sal'i va ry glands, 133 



Salts, in soil, 92 ; in protoplasm, loi, 



104 

 San Jose (san ho sa') scale, 566 

 Sap in plants, 1 19 f. 

 Scallop, 86 



Scarlet fever. Dick test for, 346 n. 

 Schick test, 345 f. 



Schizomycetes (skiz 6 mi se'tez), 430 f. 

 Scurvy, 304 

 Sea urchin, 81 

 Seedlings, 69 f. 

 Seeds, 13, and fruit. 44 f., 474 ; origin 



of, 45 ; sprouting of, 64 ff. ; embryo 



in, 67 ; food in, 69 ; distribution of, 



474 ff. 

 Segments, 15 



Segregation, law of, 508 ff., 514, 522 

 Selection, improvement through, 494 ; 



for natural adaptation, 536 f. 

 Self-pollenation, 45 

 Semen, 484, 487 

 Sensitive plant, 20 

 Sensitiveness, 20. 22; chemical, 227 f.; 



mechanical, 229 f. 

 Se'riim, 180, 341 

 Shelter, 418 f. 

 Shoot (plant axis), 13, 67 

 Sickness. See Disease 

 Sieve plates, 119, 120 

 Sight, organs of, 230 f. 

 Skeleton, human, 278, 281 ff. ; hygiene 



of, 285 f. 



Skin, functions of, 198, 227 ; structure 

 of, 198 ff. ; care of, 201. f.; hygiene 

 of. 235 



Skulls of vertebrates, 277, 287 



Sleep, 158, 369 f. 



Sleeping sickness, 303, 309; cause of, 



449 



Smallpox, vaccination and, 344 ; cause 

 of, 449 



Smell, organs of, 228 f., 235 



Smoking, effects of, 422 ff. 



Snail, 86 



Snoring, 164 



Soaps. 135 



Social heritage, 582 f. 



Society. See Civilization, Man 



Soil, relation of, to sprouting, 65, 

 495 f. ; as source of organic bodies, 

 91 f.; salts in, 92; exhaustion of, 

 93 f.; chemical changes in, 94; 

 biology of. 94 ; intensive cultiva- 

 tion of. 94 f. ; increase of, 95 ; con- 

 servation of, 95 f. ; and population, 

 96; and the forests, 552 f. 



Sound, sensation of, 232 



Space, three dimensions of, 230 



Specialties related to health, 407 ff. 



Sperm cell, 473, 484 



Spermatophytes (spfir'md it fits), 79 



Sper m^ to zo'a, 473 



Spillman, W. J., 514 



Spinal cord, 220, 223, 280, 282 



Spiracles, 15 



Spi ril'l^. 307 



Spirogyra (spi ro ji'rd), 113 ; conjuga- 

 tion in. 470 f. 



Spitting, 358, 373 



Sponges, 80 



Spores, 322, 433, 434, 470, 483 



Spraying. 569 



Sprouting of seeds, 64 ff. 



Spurge, economic value of, 440 



Squash bug, 85 



Squirrels and plague, 327 



Stamens, 42 



Starfish, 81 ; regeneration in, 483 



Stem, 13 ff., 118 f. 



Sternum, 282 



Stickleback, 486 



Stigma, 42, 48 



Stiles, Dr. Charles W., 334 



Stimulus, 217 ff., 227 fT., 232 f., 243, 



251 



