INDEX 



S4S 



Scale insect, 218. 



Scarlet tanager, 106, 122. 



School garden, 258, 263. 



School grounds, beautification of, 

 281, 374. 



Sea-urchin, 255. 



Seal, 463. 



Seed, study of, 302; collection of, 

 418; starting, 275, 299; selection 

 for improvement, 496; for school 

 garden, 269; dispersal, 342, 431, 



474- 



Seedlings, 496; see Germination. 



Sensitive plant, 342. 



Sensitiveness of plants, 338. 



Sexual coloration, 106. 



Sheep, 80, 419, 428, 462. 



Shrubs, 281, 298. 



Silk-moth, 229. 



Skink, 161. 



Skylark, 108, 109. 



Sleeping position of plants, 341. 



Slips, 462. 



Snails, 253. 



Snake, 161, 433. 



Snowbird, 119, 120. 



Squash, 375. 



Squash-bug, 216. 



Squirrel, 78, 404, 415. 



Squirrel-tail grass, 350. 



Soil study, 482. 



Solomon's-seal, 309. 



Songs of birds, 95, 108. 



Sound, lessons. Chap. XX. 



Sparrows, 103, 104, 116, 119, 120, 

 126, 129; house or English spar- 

 row, 107, 114, 119, 126, 145. 



Specimens, 34, 43, 46. 



Sphinx-moth, 226, 238, 240. 



Spider, 246, 417. 



Spines, 321. 



Spinneret, 250. 



Sponge, 257, 478. 



Spores, 304, 503. 



Spraying, 295. 



Spreading board, 182. 



Starch-making by plants, 316, 478. 



Starch test, 316, 462. 



Starchy foods, 456. 



Starfish, 255. 



Steam-engine, 485. 



Stems of plants, 305, 339; modified, 



308; underground, 308. 

 Stickleback, 174. 



Stories, as illustrative material, 39, 64. 

 Strawberry runners, 308. 

 Sucker, 173. 

 Sugar, sources, 447. 

 Sugar-beet, 448, 498. 

 Sugar-cane, 447. 

 Summary, 29. 

 Sunfish, 173. 

 Sunflower, 333, 340, 443. 

 Swallow, 103, III, 112, 113, 122, 132. 

 Swallow-tail butterfly, 236. 

 Swamp vegetation, 445. 

 Swan, 440. 



Swarming of bees, 209. 

 Sweet-pea, 226, 352. 

 Swift (bird), 102, 113, 122. 

 Swift (lizard), 161. 

 Syrphus-fly, 228. 



Tachinid fly, 224. 



Tadpoles, 150. 



Teeth, 427. 



Tendrils, 321, 341. 



Tent caterpillar, 220. 



Thistle, 336. 



Thousand-legs, 251. 



Thrush, 97, 104, 108, 122, 124. 



Tiger caterpillar, 199. 



Toad, 156, 417. 



Toadstool, 392, 367, 476, 492. 



Tomato worm, 239. 



Transpiration, 314, 361. 



Transplanting, 277. 



Trees, general, 307, 338, 358, Chap. 

 XX; stem section, 307, 358; an- 

 nual rings, 307; cambium layer, 

 359; bark, 359; branching, 360; 

 leaf arrangement, 361; foliage, 

 361; autumn colors, 362; leaf 

 faU, 363; tree flowers, 363, 450; 

 seed dispersal, 364; life condi- 

 tions, 364; forest, 366; life cycle, 

 367; planting, 378; tree list, 379; 

 shade trees, 498; Arbor Day, 374, 

 384; trees in winter, 420; leaf 

 collection, 431. 



