INDEX. 



Vesque 



on absorption by roots, 52, 78 



on filtration of water in wood, 118 



on transpiration, as affected by sub- 

 stances absorbed by root, in 

 Victoria regia, growth in length of 



leaves of, 359 

 Ville, on absorption of ammonia by 



leaves, 86 

 Vines 



on aleurone-grains, 184 



on growth of leaves in darkness, 381 



on retarding influence of light on 

 growth, 395 



on sugar in leaves, 164 

 Viscum, hypocotyl of; negative helio- 

 tropism of, 429 ; not geotropically 

 irritable, 458 ; somatotropism of, 474 

 Vitis, tendrils of (Fig. 53), 485, 489 

 Vochting 



on diagetropism, 463 



on direction of growth in darkness 

 and in light, 441 



on nutation, 369 



on pendent position of buds, 455 



on rectipetality, 418 



on reversal of geotropic proper- 

 ties, 459 



on reversal of heliotropic properties, 

 429 



on weeping trees, 409 

 Vogel, on absorption of carbon dioxide 



by leaves, 82 



Volvox, movement of, 520; reproduc- 

 tion of, 610 

 de Vries 



on absence of sugar and amides 

 from growing point, 177 ^ 



on allassotonic and auxotonic move- 

 ment, 533 v- 



on destructive metabolism, 293 ; 



on diageotropism, 470 



on diaheliotropism, 449 \,. 



on effect of high temperature on 

 plants, 278, 279 

 .on formation of autumn- wood, 35 2 - 



on heliotropism of dorsiventral 

 shoots, 442 ^ 



on heliotropism of leaves, 444 " 



on hyponasty and epinasty, 366 



on influence of transpiration on 

 absorption, 115^ 



on mechanism of curvature, 579, 

 580 



on organic acids in etiolated plants, 

 268 ' 



on osmotic substances, 41 



on calcium oxalate in plants, 231^ 



on plasmolysis (Fig. 9), 39, 43, 44, 

 335 



de Vries 



on sugar in leaves, 164 V 

 on turgidity, 41 

 on twining of tendrils, 490 

 on twining stems, 491, 509 

 on wrinkles on roots, 354 



de Vriese, on temperature of spadix, 



34, 3!<> 

 Vrolik, on temperature of spadix, 304 



Wagner 



on acrylcolloid, 31 

 on decomposition of hippuric acid 

 by plants, 237 



Warming, on temperature of spadix, 310 

 Warrington, on nitrification, 129 

 Waste products, 216, 222; fate of, 244 

 Water, absorption of, 46, 93 ; filtration 

 of, through wood, 99; movement of, 

 in plants, 89 



Water-culture, 123, 133 (Fig. 21) 

 Water, influence of currents of, on 



growth (Rheotropism), 473 

 Water-gland, 246; of Saxifrage incrus- 



tata (Fig. 19), 91 

 Water-pores, 92 

 Water-roots, 51 

 Wax, 243 



Way, on retention of salts by soil, 49 

 Weber 



on effect of light on absorption of 

 ash-constituents, 258 



on formation of organic substance 

 by leaves, 158 

 Weiss 



on anthoxanthin, 242 

 on latex, 168 



on refraction of cystoliths, 22 

 Weissmann 



on continuity of the reproductive 

 substance, 660 



on the extrusion of the polar body, 

 661, 666 



on parthenogenesis, 667 

 on theory of reproduction, 660 

 on variation, 661, 677 

 Wells, on radiation of heat by plants, 



313 

 Welwitschia, calcium oxalate in cell- 



walls of, 22 



Wertheim, on Coniin, 224 

 Wiesner 



on decoloration of chlorophyll, 266 

 on erythrophyll, 266 

 on etiolin, 241 



on fixed light-positions, 430, 447 

 on formation of chlorophyll, 262, 

 264 



on germination at low temperatures, 

 270 



