INDEX 



409 



pollen grains, 346-348, 351- 355. 



358. 385 

 pollen sac, 346, 347, 351 

 pollen tube, 347, 349, 350, 351, 



385 

 pollination, 351, 354 

 pollination, cross, 351, 355, 358 

 pollination, self, 351, 358 

 polysaccharides, 40, 41, 49, 396 

 Potato blight, 175-177 

 potential energy, 25, 38, 42, 81, 



85, 121 

 principal rays, 335, 336 

 protandrous, 356, 357 

 proteans, 45, 272, 377 

 protein ceUs, 273, 274 

 proteins, 48-44, 49, 61-63, 73. 77. 



122, 130, 142, 151, 154, 272, 



278. 375. 377. 381, 390, 392 

 prothallus, 244, 245, 248-251 

 Protista, 30, 392 

 Protococcus, 72-74, 80, 92, 93 

 protophloem, 324, 332 

 protoplasm. 31, 32, 33, 36, 56, 58, 



61-64, 64—70, 76, 77, 82, 84, 



loo-ioi, 389, 404 

 protonema, 240 

 protoxylem, 295, 296, 297, 322- 



325 

 pseudopodium, 62, 65, 68, 71 

 Pteridophytes, 29, S!43-251, 384 

 Puccinia, 178-181 

 pulses, 381 



pure culture,, 147, 148 

 " pure strains," 67, 149 

 putrefaction, 151 

 pyrenoid, 72, 73, 185, i86, 190, 



207, 208, 209 

 Pythium, 172-175 



rays, 295 



receptacle, 345, 353. 354. 365-368 

 reproduction, 71, 73, 87, 184 

 respiration, 39, 81-83, 118, 121, 



132. 135. 136. 150. 159. 289, 



305. 376. 377. 391 

 reversible gel, 54, 62 

 rhizoids, 221, 225, 233, 238, 239, 



241, 244, 245 

 rhizomes, 257, 259-262. 265, 266, 



381 

 ringworm, 169 

 root cap, 285, 289, 290-292 

 root hairs, 241, 289, 290, 294, 296 

 root, the, 241, 288-301 



runners, 261 



Rust of wheat, 178-181 



SaccharomycBs, 128, 136 



salts, 73, 77, 123, 130, 142, 152, 



159, 186, 217, 220, 240, 241, 



290, 296, 300, 304, 311, 392, 



393. 395 

 Saprolegnia, iji, 172 

 saprophytes, 127, 157-168 

 saprophytic, 78, 157, 158 

 sapwood, 337 

 scale leaves, 259, 262, 325 

 secondary meristem, 298, 328, 331 

 secondary rays, 334-336 

 secondary thickening, 255, 298, 



328 

 secondary tissue, 298, 329 

 secretory cells, 272 

 seed, 254, 255, 258, 361-364, 



365. 368, 369-372. 375-388 

 Seed Plants, 28, 243, 252, 254, 255, 



344. 384-386 

 semipermeable membrane, 56, 62, 



108, 109 

 sepals, 345, 346. 353 

 sexual differentiation, 184, 190, 



200, 205, 210 211, 234 

 sieve plate, 274 



sieve tubes, 229, 274, 293, 297, 



311, 324, 332, 333, 337 

 sol, 48-50, 53. 54-56, 61-63. loi, 



389 

 solutes, 48, 55-57. 61, 108, 293, 



296, 299 

 solution, colloid, 48 

 solution, crystalloid, 48, 55, 59, 391 

 solution, " true," 48, 59 

 solvents, 48, 55, 56 

 soma, 184, 185, 195, 198, 205, 206 

 species, 27, 42, 43, 67, 148, 149, 



398, 401, 403 

 spectrum (of chlorophyll), 113 

 spermophytes, see seed plants 

 sperms (= male gametes) 198, 199- 



201, 212, 223-225, 230, 235, 

 236, 244, 245, 248, 250, 251 



spirillum, 139, 148 



spirochsete, 148, 154, 155 



sporangiophore, 160 



sporangium, 160, 161 



spore capsule, 237, 240 



spores, 131, 143-145, 146, 151, 



155, 160-162 

 sporidia, 179, 180 



