Index 



Sequoia, 241 



Seven-leaf clover, 109, 287 



Sheep, 309 



Sheep-killing grasses, 261 



Shingle, 163 



Silva Caledonia, 229 



Sisyrhinchium, 234 



Snares Island, 107 



Snowdrop, 204 



Soil, 48 



Soldanella, 185 



Solomon's seal, 146 



Somaliland, bush of, 312 



Spanish flora, 219, 220, 255, 276, 308 



Spartina association, 1 63 



Sphagnum, 71, 72, 73, 91 



Spiranthes, 233 



Spraying of weeds, 258 



Spruce, 291 



Spruce-galls, 200 



Spurs of petals, 119, 120 



Statistical methods, 183 



Statolith theory, 147 



Steppe grasses, 263, 266 



Steppes, invasion of, 232 



Stimulus of evil, 327-338 



Stocks, 303 



Streptocarpus, 79 



Struggle for existence, 156 



Succulents, 172-173 



Sudd of Nile, 133, 134 



Sugars, 119, 328 



Summit floras, 89 



Sundew, 150 



Sunshine, effects of, 187, 233, 240 



Sycamore, 291, 291, 292 



TACITUS, 229 

 Tannin, 178 

 Tendrils, 148 

 Teneriffe, 275 



Temperature, extremes of, 34 

 Tertiary flora, 218, 276 

 Thais, 108 

 Thistles, 257 

 Thorns, 25, 174-176 

 Tibetan plants, 94 

 Tillering of corn, 263 

 Tococa, 206 



Torenia, iio, 155 

 Tracheid, 190 

 Trades dust, 37 

 Trapella, 129 

 Tree-ferns, 80 

 Tropical forests 316-326 

 Tundra, 92 

 Tussocks, 271 



ULE, Dr., 209 

 | Ultraviolet rays, 1 87 

 | Urboden, 19 



j Vaccination, 58 



! Variation in flowers, 120 



j Variations, origin of, 182, 183, 327, 328 



Vaucheria, 162 



Venus' flytrap, 201 



Victoria regia, 132 



Viola, changes in, 1 84 



Volvox, 45 



Vossia, 134 



WALNUT, Burbank's, 290 



Water-lily zone, 130, 132 



Water plants, 125, 279 



Water pollution, 139 



Wax of flowers, 120 



Weathering of rocks, 68 



Weeds, 95, 231, 232, 254-258, 311 



Weissmannism, 291-298 



Welwitschia, 179 



Werchojansk, 236 



Wheat, 254, 284, 285, 288, 334 



Willows, 130, 132, 139 



Wind, effect of, 189 



Wood, 24, 190, 245 



Wood anemone, 26 



Wood-floor, flora of, 244 



Worms, 50, 197 



Wounds, effect of, 33 * 333, 334 



Wulfenia, 181 



XANTHOPHYLL, in 



YIELD of crops, 259 



Young leaves v. old ones, 152 



ZOSTER A association, 158 



Printed by BALLANTYNE, HANSON & Co. 

 Edinburgh 6* London 



