530 



INDEX 



Yeast, 49, 169 ; action of, on 

 sucrose, 488 ; co-enzyme of, 

 492 ; effect of oxygen on, 487 ; 

 enzymes in respiration of, 487 ; 

 fenmentation, 168, 489 ; re- 

 spiration of, 489. See also 

 Saccharomyces. 



— gum, 182. 



Yeasts, wild, 487, 489. 



Ylang Ylang, 69. 

 Yucca, 176. 



Zea, 254, 259, 310. 512. 



— mais, 69, 201, 410, 457. 



Zein, 426, 431. 



Zygnema, 267. 



Zymase, 460, 486 ; isolation, 493. 



Zymin, 492, 494. 



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