INDEX 



799 



Wild Cabbage, Brassica oleracea 



Wild Cherry, Primus cerasus 



WiUonghbeia, 689 



Willow, Salix 



Willow-herb, Epilobium 



Wind-dispersal, seeds, 585 



Winter buds, *176 



Wistaria, 672, 673 



Witches' -brooms, 449 



Wood, 148 ; arrangement of the tissues in, 

 151 ; autumn, 153 ; grain of, 157 ; 

 heart-, 158 ; splint-, 158 ; spring, 

 153 ; subsequent alterations of, 157 



Wood-fibres, 148 



Wood parenchyma, 149 



Woodsia, antheridium, *510 



Wormwood, Artemisia Absinthium 



Wounds, healing o$ 164 



Xanthophyll, 19 

 Xenogamy, 201 

 Xerochasy, 333 

 Xeromorphy, 169 

 Xerophytes, 168 

 Xylem, 68 



Yeast Fungi, Saccharomycetes 

 Yeast fungus, fermentation, 275 



Yew, Taxus baccata 



Yucca, 725 ; pollination of, 556 



Zamia, 589 ; fertilisation, *565 ; formation 

 of spermatozoids in, *562 ; spermato- 

 zoids, *563 



Zanardinia, 414 



Zanichellia, 721 



Zea, *92, 734, 735 ; vascular bundle, *102, 

 *103 



Zingiber, *744, 745 



Zingiberaceae, 745 



Zoosporangia, 196 



Zoospores, 196, 369 



Zostera, 721 



Zygnema, 395 



Zygnemaceae, 395 



Zygogynum, 632 



Zygomorphic, 72 



Zygomorphic flowers, geotropic orienta- 

 tion of, 343 



Zygomycetes, 434 



Zygophyceae, 393 



Zygophyllaceae, 652 



ZygosaccharomyceSy 449 



Zygospore, 199, 369, 434 



Zygote, 199, 369 



Zymase, 275 



THE END 



Printed by R. & R. CLARK, LIMITED, Edinburgh. 



