INDEX 



603 



worts, 329-335; Fungi, 351-405; 

 Green Algae, 301-318; Lichens, 

 379-382; Myxobacteria, 350; 

 Red Algae, 324^-329; Sac 

 Fungi, 363-379; Slime molds, 

 336-341; Water Molds, 353-363. 



Thorns, 272, 271* 



Tillandsia, 163. 



Timothy heads, showing improve- 

 ment, 577. 



Tissues, general view, 126-134; ab- 

 sorbing, 131, 131*; conductive, 

 130, 130*; food-making, 132, 

 132*; meristematic, 126, 126*; of 

 leaves, 242-252; of roots, 146- 

 150; of stems, 182-203; protec- 

 tive, 127, 127*, 128*; reproduc- 

 tive, 133; secretory, 133, 133*; 

 storage, 132; strengthening, 129, 

 129*, 130*- 



Toadstools, 382; described, 384; de- 

 structive, 388. 



Tobacco, flower, 13, 12*; leaf arrange- 

 ment, 239*; mutations, 620. 



Tomato, described, 491; ovary, 36, 

 34,* 36*; pistil natural size, 37, 

 37*. 



Torus, 12. 



Toxins, 123. 



Tracheae, 131. 



Tracheids, 130, 131*. 



Trailing Arbutus, 490. 



Transpiration, 241; advantages, 263; 

 amount, 262; conditions affect- 

 ing, 263; dangers, 265; described, 

 260-269; protection against, 266. 



Traumatropsim, 152. 



Tree Ferns, 427, 428*. 



Trichogyne, 327. 



True Ferns, 426. 



Truffles,. 366. 



Tryptophane, 282. 



Tube nucleus, 42, 42*. 



Tuber, 179, 179*; described, 181. 



Tuberales, 366. 



Tubular Algae, 316-318. 



Tubular flowers, 25, 24*- 



Turgor pressure, 119. 



Turpentine, 285. 

 Twiners, 176. 

 Typhaceae, 495. 

 Tyrosin, 282. 



Ulothrix, 311, 311*. 

 Umbelliferae, 488. 

 Umbel, 30, 30*, 32*. 

 Uredinales, 396. 

 Uredospore, 399. 

 Urticaceae, 478. 



Vacuoles, 114, 114*, 115*, 156*. 



Variations, 513-532; causes, 525; 

 classes, 514; fluctuating, 516, 518*, 

 519*; in fruits of Cueurbits, 529; 

 in Timothy, 513*; in ears of 

 Corn, 514*; and natural selection, 

 665; in leaves and fruits of an 

 Oak, 515*; discontinuous or mu- 

 tations, 520. 



Vascular bundles, 130, 130*. 



Vascular cylinder, 145, 146, 146*. 



Vaucheria, 317, 316*- 



Vegetative reproduction, 409, 422. 



Vein, 244, 244*. 



Veinlets, 245, 244*- 



Velamen, 164. 



Venation, 245; netted, 245, 244*; 

 parallel, 245, 244*. 



Venter, 490, 410*. 



Venus Flytrap, 273, 273*. 



Vernal habit, 170. 



Vitamines, 284. 



Volatile oils, 285. 



Volva, 386, 384*- 



Volvocales, 307. 



Volvox, 305, 306*. 



Walnut family, 474. 

 Warmth, as an ecological factor, 501. 

 Water, as an ecological factor, 501. 

 Water Ferns, 426. 

 Water Mold, 353. 



Wheat, flower, 21, 22; pistil, 34; ker- 

 nel, 65, 66*, 281*; seedling, 104.* 

 White Heart Rot, 389. 

 White Rust, 359. 



