392 
PLANT STUDIES 
Sensitive plants, 11, 50. 
Sepal, 79. 
Seta, 303. 
Sexual spore, 230. 
Shoot, 53. 
Slime moulds. 290. 
Smilax, 61. 
Societies, 1, 169. 
Soil, 90, 145, 173. 
Sperm, 231. 
Spermatophytes, 222, 343, 344. 
Sphagnum, 318. 
Spiral, 365. 
Spirogyra, 244. 
Sporangium, 230, 325. 
Spore, 110, 229. 
Sporogonium, 303, 306. 
Sporophore, 266. 
Sporophyll, 346. 
Sporophyte, 303, 325. 
Stamen, 79, 346, 359. 
Stem, 54, 83, 139. 
Stigma, 125, 362. 
Stipules, 35. 
Stomata, 38. 
Strobilus, 338. 
Struggle for existence, 142. 
Style, 125, 362. 
Symbionts, 158, 295. 
Symbiosis, 158, 295. 
Temperature, 145, 171. 
Thallophytes, 222, 224, 299, 344. 
Transpiration, 31, 154. 
Tuber, 74. 
Tumble weed, 117. 
Ulothrix, 237. 
Vascular system, 83. 
Vaucheria, 242. 
Vegetative multiplication, 109, 
229. 
Veins, 36, 40. 
Violet, 117. 
Water, 142, 151, 170; reservoirs, 
201. 
Water ferns, 336. 
Wheat rust, 279. 
Wind, 174. 
Witch hazel, 118. 
Woodbine, 63. 
Xerophytes, 175, 188. 
Yeast, 278. 
Yucca, 131. 
Zoospore, 230. 
Zygotes, 237. 
THE END 
