42 



INDEX 



References are to pages 



Vaccination, discussed . . . 

 Vacuole, food, of amoeba . . 



contractile 



Vacuoles, in nerve cells . . . 

 Valves of arteries and veins . . 



of stomach 



Vapor, a form of water . . . 

 Variations in legs of birds . 

 Varied diet of man .... 

 Various forms of cells in 

 human body (fig.) . . . 

 Vascular bundles, formation 



of tubes by 



of root 



of woody stems 



Vascular system in plants . . 

 Vase-like leaves of pitcher 



plant 



Vaseline, use of in transpira- 

 tion experiment 



Vase-shaped organs (arche- 



gonia) of moss 



Vedalia, beneficial beetle . . 

 Vegetable food, highest form 



of 



Vegetable forms of protein 

 cheaper than meat . . . 

 Vegetable nitrogen, source of 

 Vegetables, new varieties pro- 

 duced by cross-pollination . 



food of man 



Veins, compared with fibro- 

 vascular bundles .... 



diagram of (fig.) 



of leaf 268, 



of man 



of the leaf of pteris (fig.) . . 



of wing of insect 



Velamens 



Ventilation 



room at night, direct heating 



(fig.) 



indirect heating (fig.) . . . 

 room in daytime, direct heat- 

 ing (fig.) 



indirect heating (fig.) • . • 

 Ventral blood vessel of earth- 

 worm 



250 



48 



49 



225 



202 



168 



9 



136 



170 



189 



268 

 268 

 287 

 278 



389 



275 



365 



27 



311 



317 



400 



306 

 2 



268 

 201 

 272 

 197 

 371 

 29 

 399 

 195 



197 



196 



197 

 196 



82 



Ventral nerve chain of cray- 

 fish 90 



Ventral surface of earthworm 80 



Ventricle (fourth) of brain . . 119 



Ventricles of heart . . . . 201 

 Venus mercenaria, edible mol- 



lusk 100 



Venus's flytrap (fig.) .... 391 



rapid movement of .... 392 



use of leaves in 294 



Vermiform appendix . . . 168 

 Vertebrates, a group of ani- 

 mals 6 



discussed 103 



Vesper sparrow, at hemp and 



millet station 148 



Vetch, member of pulse family 329 



Villi, described .173 



Villus, diagram of (fig.) . . . 174 

 Vines, comparison with tree 



trunks .... ... 286 



Violet, capsule of (fig.) . 308, 310 



cleistogamous flower of . . . 302 



example of irregular flower . 302 



fruit of (fig.) ....... 308 



long-spurred (fig.) ..... 397 



plant (fig.) 301 



Virginia deer (fig.) .... 156 



fawns of (fig.) 156 



Virgin forest (fig.) 379 



Virus in inoculation .... 252 



Viscera of clam 98 



Visceral ganglion of clam . 98 



Vitreous humor 216 



Vocal cords, location of . . . 194 

 Voice box (fig.) .... 193, 194 



Voluntary muscle cells (fig.) 188 



Voluntary muscles .... 188 



Volvox 55 



colonial protozoa, example of . 55 



described (fig.) 56 



Vomiting 168 



Vorticella (fig.) 52 



Vultures, beneficial birds . . 147 



example of Raptores .... 141 



toe of 140 



W 



Walking sticks 20 



Walnut, family discussed , . 327 



