392 



PLANT STUDIES 



Sensitive plants, 11, 50. 



Sepal, 79. 



Seta, 303. 



Sexual spore, 330. 



Shoot, 53. 



Slime moulds, 300. 



Smilax, 61. 



Societies, 1, 169. 



Soil, 90, 145, 173. 



Sperm, 331. 



Spermatophytes, 333, 343, 344. 



Sphagnum, 318. 



Spiral, 365. 



Spirogyra, 344. 



Sporangium, 230, 835. 



Spore, 110, 329. 



Sporogonium, 803, 306. 



Sporophore, 366. 



Sporophyll, 346. 



Sporophyte, 803, 325. 



Stamen, 79, 346, 359. 



Stem, 54, 83, 139. 



Stigma, 135, 363. 



Stipules, 35. 



Stomata, 38. 



Strobilus, 338. 



Struggle for existence, 143. 



Style, 135, 363. 



Symbionts, 158, 395. 



Symbi(.sis, 158, 395. 



Temperature, 145, 171. 

 Thallophytes, 332, 234, 399, 344. 

 Transpiration, 31, 154. 

 Tuber, 74. 

 Tumbleweecl, 117. 



Ulothi-ix, 337. 



Vascular system, S3. 



Vaucheria, 343. 



Vegetative mulliplieation, 109, 



339. 

 Veins, 36, 40. 

 Violet, 117. 



Water, 143, 151, 170; reservoirs, 



301. 

 Water ferns, 336. 

 Wheat rust, 379. 

 Wind, 174. 

 Witch hazel, 118. 

 Woodbine, 63. 



Xerophytes, 175, 188. 



Yeast, 378. 

 Yucca, 131. 



Zoospore. 330. 

 Zygotes, 237. 



THE EN1> 



