Index. 



291 



Vaucheria sessilis, transverse septa in, 86. 

 vacuole of, 84. 



zoospore of, 87. 

 Ventilating pores of Marchantia, 123. 

 Vessels, 221, 228. 



Vestigial structures, 273. 

 Volvox aureus. Lecture X., 75-82 (Figs. 

 13, 14, 15). 



asexual reproduction of, 78. 



cell-wall of, 76, 77. 

 cilia of, 77. 



embryo of, development of, 79. 



- fertilisation of, 81. 

 motion of, 76. 



number of cells in, 76. 



ova of, 80. 



photosynthesis of, 78. 



protoplasmic connections of, 77. 



reproductive cells of, 81. 

 respiration of, 78. 



response to light of, 77. 



sexual reproduction of, 79. 



size of, 76. 



somatic cells of, 81. 

 sperms of, 80. 



- structure of, 76. 



WATER, cohesion-theory of ascent of, 

 163, 224 et seqq. 



cohesion of, in annulus, 163. 



Water, needed for fertilisation, 130, 131, 

 138, 164, 165, 167, 175. 



path of, in Pinus, 190. 



Ranunculus, 224. 



raised in Aspidium, 156. 



Ranunculus, 224 et seqq. 



trees, 227. 



tensile strength of, 224, 227. 



transmits pull, 156, 224. 



Wood (= xylem) of Aspidium, 149, 155. 



of Pinus, 186. 



Ranunculus, 217, 220. 



parenchyma, 151, 155, 221. 



primary, 186, 187. 



secondary, 186, 187. 



sections of, 195, 196, 197. 

 spring and summer, 187. 

 Wing of pine-seed, 206. 



XANTHOPHYLL, 46. 

 Xylem. See Wood. 



YEAST. See Saccharomyces. 

 III., IV., 23-34 (Fig. 5). 



ZOOSPORES of Vaucheria, 87. 

 Zygote of, 8, 265. 

 Zymase in yeast, 33. 



Mucor, 96. 



Penicillium, 101. 



Lectures 



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