INDEX 



4s:j 



Soil, transported, 109. 

 washed away on slopes, 113. 

 water-holding capacity of, i;!"2. 

 water ol, 103. 



— — amount suited to plants, 130, 131. 



how absorbed, 111-113, 129. 



how regulated, 132, 133. 



Soil-cmmbs, 124-127*, 128*. 



Soil-floccules, 126, 127,* 128. 



Soil-mulch, 115,* 116,* 117,* 12,->,* 129, i:;:i. 



Soil-particles, 119,* 120,* 128 * 



Solomon's seal, storage of foinl in, 313. 



Sorrel, wood. See Oxalis. 



Spanish Bayonet, protection against ani- 

 mals. 221. 



Spatterdoek, 337. 



Species, origin of, 441-453. 



Sphagnum. See Peat Moss. 



Spines protect against animals, 221, 250, 

 260, 320, 331.* 



Spiral tracheids, 227,* 229, 230, 231.* 



Spongy tissue of leaf, 198,* 199,* 200. 



•Spontaneous generation, 365. 



Spores of bacteria, 362.* 365. 



— Corn-Smut, 397, 398,* 399.* 



— Mildew, 407.* 



— Mould, 393, 394,* 395,* 396,* .■197.* 



— Rusts, 401, 402,* 403,* 404.* 

 Sport. See Variation, sudden. 

 Spraying, 407. 



with oil injures leaf, 215. 

 Spring, fat changed to starcli in, 2.')9. 



run of sap in, 243, 259. 



sugar changed to starch in, 259. 

 Spring-wood, 232,* 236.* 247. 

 Springs, formation of, 117. 

 Spruce, protection against drying, 333. 



wood of, 230. 

 Squash, cross-pollination of, 302. 



effect of light on, 184,* 185. 



fibrous bundles of, 224,* 226, 227.* 



fruit of, water conveyed to, 317. 



germination of, 54,* 55,* 56, 81.* 



mieropyle of, 8,* 9. 



path of proteid in, 224,* 227,* 254-256. 



water in, 224*-227,* 228-230. 



peg of, 54*-56. 



root-cap of, 86. 



root pressure of, 243. 



S{|uash, sap of, forces which raise, 241. 



seed-cover of, holds water. 20 



seedlings of, 184,* 185. 



sleep position of seed-leaf of, 218 



stem of, microscopic structure of, 224,* 

 226, 227,* 228, 229, 246. 



tendrils of, 272. 



transpiration of. 216. 

 ■Squash hybrids. 429. 

 .Squaw-vine. See Partridge-berry. 

 Squirrels, Ground, bury seeds, 69. 

 Squirting Cucumber. See Cucumber, 



Squirting. 

 .Stannard, on soil, 133. 

 Starch, absorption of, from le.-ivc-v, Is;;, 25s. 



as food. 164, 176. 



changed to fat, 25:i, 2.59. 



oil, 253. 314. 



sugar, 167-169, 258, 314, 391. 



conveyed to wood, 2.'i2,* 233. 



decomposition of, 186,* 1H7. 



digestion of, 166-169. 



disappears in darkness, 182,* l.s:i 



energy from, 176, 196. 



formation of, dependent on air supply, 

 191.* 



chlorophyll, is,',, 



light, 182. 



in variegated leaves, 18.'). 



leaves, 182-203, (182,* 1S4, 



186,* 191,* 192,* 193,* 198,* 199,* 201,* 

 202*). 



stem, 278. 



fuel value of, 176, 196. 



in buds, 253. 



— cMorophyll grains, 201,* 202.* 



— cortex. 258. 



— flour, 177. 



— fruits, 314. 



— growing region, 253, 2.54. 



— leaf-cells, 202.* 



— medullary rays 232,* 233, 2.58. 



— potato, .528. 



— rind, 258. 



— seeds, 65.* 164, 314. 437. 



— wheat, 177, 178. 



— wood, 232,* 233, 257-259. 



path of, in stem, 169, 2."i4, 257. 25,s. 313. 

 314. 



