INDEX 



295 



Vallisneria, abscission of male flowers of, 

 216 ; rate of propagation of stimuli in, 

 185. 



Vallot, 15. 



Van der Does, 230. 



Vanilla aromatica, contraction in roots of, 

 14 ; growing zone in root of, 8. 



Van Tieghem, 168. 



and Bonnier, 220. 



Variation, 189. 



Variegation, 174, 175. 



Varieties, propagation of, 196. 



Varigny, de, 260. 



Vaucheria, 41 ; apical growth of, 5 ; cell- 

 segmentation in, 39; galls of, 171; 

 growth of, 33 ; healing of wounds of, 

 133 ; influence of air-pressure on, 1 18 ; 

 change of temperature on, 82 ; 

 cold on, 238 ; - - coloured light on 

 spore-formation in, 102 ; concentra- 

 tion on, 121 ; external conditions on 

 reproduction of, 198 ; light on repro- 

 duction of, 91 ; water on formation 

 of zoospores of, 123 ; intermediate 

 character of, 6 ; suppression of sexual 

 organs in absence of CO 2 , 100 ; V. 

 repens, limits of temperature for growth 

 and zoospore formation of, 81 ; tem- 

 perature limits for growth of, 76. 



Vegetative reproduction, sufficiency of, 199. 



Velten, 231. 



Veratrine nitrate, dissociation of, 273. 



Verticibasality, inherent, 155 ; induced, 

 156, 157 ; origin of, 160. 



Verworn, 188, 224 ; on thigmomorphic re- 

 actions, 132. 



Vibrio cholerae^ influence of desiccation on, 

 251. 



Vicia, growth of root of, 17; V. Faba, 

 growing seedling of, 8, Fig. I ; heat- 

 rigor in, 225 ; influence of tempera- 

 ture on growth of, 77. 



Victoria regia, rate of growth of, 17. 



Villari, 67. 



Villinger, on immotile varieties, 194. 

 Vinca minor, ultra-maximal temperature 

 for, 231. 



Vine, growth of, as evergreen, 213 ; influ- 

 ence of transitory cold on, 210. 



Vines, 74, 101, 102, 204 ; on influence of 



light on growth, 96. 



Viscum album, connexion of, to host, 178 ; 

 influence of light on germination of, 92. 

 Vitis vim/era, grafting on petiole of, 176. 



Vochting, 3, 7, 47, 67, 81, 87, 91, 93, 99, 

 loo, 104, 109, 122, 123, 127, 132, 139, 

 142, 144, 145, 150, 152, 158, 160-4, 

 166-9, I 7 I > I73~5 J 87, 218; on con- 

 tinuity in grafts, 178 ; on dorsiventrality, 

 153; on influence of oxygen on forma- 

 tion of root-hairs, 115; on inverted 

 grafting, 176 ; on retarding action of 

 gravity on growth, no; on reversal 



experiments, 159; on verticibasality, 



155- 



Vogel, 246. 



Volkens, 206. 



Volume elasticity, 50. 



Von Tubeuf, 122. 



Von Webbstein, 192. 



Vries, de, 28, 58, 63, 73, 83, 99, 101, 118, 

 120, 152, 165, 176, 189, 190, 192, 206, 

 257 ; on cardinal temperatures for 

 growth, 76 ; on causes of annual rings, 

 215 ; on contractile cells in roots, 14; 

 on resistance to heat, 224-31 ; on 

 stretching due to turgor, 60. 



Wachter, 128. 



Wakker, 122, 125, 158, 167, 171, 209. 



Waldeger, 194. 



Walz, 86, 87, 91. 



Warburg, 32, 134. 



Ward, 113, 130, 170. 



Wasserzug, on motile varieties, 194. 



Water, influence of, on cohesion and elas- 

 ticity, 55 ; on form and structure, 

 120 seq. ; on growth, 118; -- on 

 leaf- fall, 218 ; -- withdrawal of, 249; 

 partial, 250; complete, 25 1 ; - by 

 freezing, 245. 



Water-lily, tension in petiole of submerged 

 leaf of, 122. 



Water-percentage, influence of, on tissue- 

 strains, 66. 



Water-vapour, influence of, on elongation 

 of pith-cylinder, 66. 



Weed, on thermophiles, 77. 



Weeping willow, influence of gravity on, 

 no. 



Wehmer, 258, 271. 



Weinzierl, 55, 56. 



Weismann, 223 ; on heredity, 187, 188; on 

 reproductive and somatic plasma, 148. 



Weisse, 73, 144, 145, 154. 



Welter, 233. 



Weliuitschia, intercalary growth in leaf of, 



9- 



Weng, I0i. 



Went, 8, 14. 



Werner, 117, 121. 



West, 94, 238. 



Westermaier, apical growth of vascular 

 cryptograms, 5. 



Wettstein, 7, 12. 



Wheat, mummy, 254. 



Wichura, 154; on vitality of willow seeds, 

 254. 



Wieler, 114, 118, 122, 207; on causes of 

 annual rings, 216; on influence of 

 oxygen and air-pressure on growth, 

 115 ; on periodicity, 208. 



Wiesner, 2, 6, 7,20, 21, 22, 25, 29, 73, 81, 

 86, 87, 88, 91, 92, 95, 100, 102, 109, 130, 

 154, 166, 167, 186,210; on cessation of 

 growth in intense light, 94; on influ- 



