INDEX 



767 



elements of, *147 ; 

 f elements in, 148 ; 

 eptate, 146 ; spring. 



Wistaria, C26 

 Witches'-brooms, 399 

 Woail, Isatis tinctoria 

 Wolffia, 698 

 Wood, antumn, 142 ; 



fibres, 146 ; livini 



secondary, 140 ; : 



142 



Woodruff, Asperula 

 Wood Sorrel, (Ivalis 

 Wounds, healing of, 161 



Xantheiu, 71 

 Xantliophyll, 71 

 Xanthoria, *418 

 Xerophytes, 197 

 Xylem,'l21 

 Xyloclirome, 143 



Yam, Dioscnrea 



Yeast fungus, see Saccliaroviyces 



Yew, Ta.rus 



Yucca, 155, 705 ; flower, *492, *497 ; 

 panicle, *492 ; pollination, 496, *497 



Zamla, *506, *507, 529 ; fertilisation, 

 *507 ; sperniatozoids,*506, *507 



Zanichellia, 686 



Zea, *121, *r22, *128, 693; vascular 

 bundle, *121, *122 



Zlngihcr, *710, 711 



Zingiberaceae, 709 



Zinnia, 683 



Zoogloea, 334 



Zostera, 686 ; pollination, 495 



Zygnemaceae, 348 



Zygomorphic flower, 488 ; symmetry, 

 16 



Zygomycetes, 384 



Zygophyllaceae, 602 



Zygosaccharomycis, 400 



Zymase, 246 



THE END 



Printed by R. & R. Clark, Limited, Edinburgh. 



