468 



INDEX 



X-Rays, effeqt of, 123 



Yeast, 7, 13, 14, 43 

 bottom, 48 

 cellulose, 43 

 classification, 47 

 commercial preparation of , 190 

 false, 47 

 pathogenic, 393 

 relationships, 47 



Yeast, structure, 43 



spores, 45 



top, 48 



true, 47 



vegetative multiplication, 44 

 Yellow fever, 399 

 Yersin, 350 



Zygospore, 53 

 Zymases, 161, 166, 183 



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