INDEX 



601 



Secondary leaves, 234. 



Secondary root, 102; origin, 150, 150*. 



Secretory tissue, 133, 133* 



Seed coat, 55; function, 56. 



Seed plants, 3; described, 445-470. 



Seedlings, 101; Common Bean type, 

 107, 106*; comparative size, 110; 

 Grass type, 102, 101*, 102*, 103*, 

 104*; Onion type, 106, 105*; Pea 

 type, 109, 110*; types, 102-110. 



Seeds, dissemination, 82-88; germi- 

 nation, 89-98; nature, 55; of 

 Cycads,450; of Pines, 457; purity 

 and analysis, 74-77; structure, 

 56, 57, 56*, 57*; testing germi- 

 native capacity, 98-101; types, 

 58-67. 



Segregation and purity of gametes, 

 544. 



Segregation and reduction division, 

 554. 



Selaginella, 438; described, 440-444. 



Selection, 575. 



Selection of mutants, 579. 



Selective absorption, 160. 



Self-pollination, 48. 



Semi-permeable membrane, 117. 



Sepals, 11, 10*, 11*. 



Sessile leaf, 235, 235*. 



Seta, 420. 



Sex cells, 302. 



Sex organs, 302. 



Sheep Sorrel, 479*. 



Sieve tubes, 131. 



Silphium perfoliatum, 236*. 



Simple stems, 167. 



Sinigrin, 286. 



Siphonales, 302; described, 316, 316*, 

 317*. 



Smartweed, 479*. 



Smuts, 384; described, 392-396. 



Soil, as the home of roots, 152-162; 

 as an ecological factor, 502; 

 microorganisms, 155; origin, 152; 

 rock constitutents, 152; solution, 

 158; water, air, and humus, 153; 

 fungi, 155. 



Solonaceae, 491. 



Solanin, 286. 



Solanum Carolinense, 492. 



Solanum nigrum, 491. 



Solanum rostratum, 492. 



Solitary flowers, 27. 



Solsola Kali, var. tenuifolia, 480*. 



Somatoplasm, 530. 



Soredia, 381. 



Sorus, 429, 430*. 



Sour Cherry, 212, 212*. 



Spawn of the Mushroom, 387. 



Special forms of leaves, 270-273. 



Species, in classification, 291. 



Spermatophytes, 292; described, 445- 

 470. 



Sperms, 302. 



Sphagnales, 417; described, 422-424. 



Sphagnum, 422, 423*. 



Spike, 17, 29, 29*, 32*. 



Spikelets, of Com, 17, 18*, 19*; of 

 Oats, 20, 20*, 21*; of Wheat, 22, 

 22*. 



Spindle fibres, 124. 



Spiral vessel, 188, 189*, 190*. 



Spirillum, 341. 



Spirogyra, 315, 315*. 



Spongospora subterranea, 341. 



Spongy tissue, 249, 250*. 



Sporangia, 320, 338. 



Sporangiophore, 437. 



Spore, 338; of Bacteria, 343, 343*. 



Sporidia, 394. 



Sporophore, 383. 



Sporophylls, 437, 439, 441, 447, 448, 

 452, 453, 454, 460, 462. 



Sporophyte, of Angiosperms, 459- 

 463; of Cycads, 446, 446*; of 

 Equisetales, 436-437; of Ferns, 

 426-431; of Liverworts, 411, 

 410*; of Lycopodium, 439-440; 

 of Moss, 418, 418*; of Pines, 452- 

 455; of Selaginella, 441, 440*. 



Spurge family, 486. 



Squash, arrangement of flowers, 27*. 



Squirting Cucumber, 88, 87*. 



Stamens, 11; described, 41, 41*. 



Staminate flower, 13; of Corn, 17, 16*, 

 17*; of Pumpkin, 12*. 



