418 



INDEX. 



Yeast, change of, a trade custom, 



22 

 reason of addition of yeast to -wort, 



3 

 proportion commonly added, 3 

 reason of the large proportion 



used, 343 

 Yeast-cells abundant in brewing 



laboi-atories, 75 

 gradual senescence of, 245 



Yeast-cells, mode of examining fruits 

 for, 267 (footnote) 

 necessary relation to " alcoholic 

 fermentation," 275 

 Yeast-water, definition, 79 (footnote) 

 exhaustion of yeast by, 171 

 use of in pure growths (peni- 

 cillium), 88 

 "Youth" of ceUs, 246 



I^ardon tt Sons, Pi-intei'S, Fattrnoster Jiotv, London. 



