478 



Tnd 



ex 



Waft age of seeds, 387 



\\'alking Fern, 381 



Warping of wood, 187; diagram, 188 



Water, in photosynthesis, 30, 48; storage, 

 269; protection against, 256, 271 



Water culture, methods, 135, 136 



Water-lily seed, 394 



Water-molds, 451 



Water-plants, aeration system, 195; 

 448; 464 



Water-rolled balls, 376 



Waxes, 118 



Wearing out of varieties, 443 



Weismann, 415, 423 



Wild Geranium, 385 



Wind pollination, 307 



Winds, in pollination, 305; in dissemina- 

 tion, 387; protection against, 256; 257 



Wings of seeds and fruits, 70, 388 

 Winter-killing, 202 

 Winter, vegetation in, 367 

 Witches Brooms, 371 

 Wooden flowers, 371 

 Work of plants, 76, examples, 77; reality, 

 79 



Xanthophyll, 41 ; in autumn leaves, 41 

 X-rays, on plants, 251 

 Xenia, 300 

 Xerophytes, 465 



Yeast, 97, 451 



Zoospores, 280, 380 

 Zymase, 129 



