INDEX 



255 



W 



Weigert, hyper-regeneration, 201 



Weismann, heredity, 208; matura- 

 tion significance, 211; old age and 

 death, 70 



Wilson, E. B., 14, 27, 210, 212, 217; 

 See Sedgwick. 



Winiwarter, sex chromosomes of 

 man, 228 



Woodruff, so-called immortality of 

 Paramecium, 71 



Work done by plants for animals, 

 128 



Wright, opsonin, 197 



Yeast, alcohol and acetic acid forma- 

 tion, 38; culture media, 31; endo- 

 enzymes, 39; fermentation, 37; 

 reproduction, 30; spore formation, 

 31; structure, 29 



Zoogloea, jelly secretion by bacteria, 

 34 



Zoology, subject matter, i 



Zymase, 39 



Zymogen, basic substance of en- 

 zymes, 37 



