ALCOHOLIC FERMENTS. 



239 



cells, gives a distinct fermentation in beer-wort, yielding as 

 much as T3 per cent, by volume of alcohol. It does not 

 ferment maltose solutions. It inverts cane-sugar, and in 10 

 per cent, and 15 per cent, solutions of this sugar in yeast- 

 water, it yields respectively 5*1 and 6*2 per cent, (volume) of 

 alcohol after fourteen days' cultivation at 25C. ; the last 



FIG. 76. Torula : sedimentary forms after one day's growth in beer-wort at 25 C. 

 (After HANSEN.) 



growth yielded 7 per cent, (volume) of alcohol in two months. 

 Dextrose solutions of the same concentration and under similar 

 conditions gave 6'6 and 8 '5 per cent, of alcohol by volume. 



The seventh species (Figs. 76 and 77) was found in the soil 

 under vines. The sedimentary cells are most frequently oval 



FIG 77. Same species as Fig. 76. Film -formation on a wort-culture ten months old. 

 (After HANSEN.) 



and in part larger than those of the last species. Certain 

 cells of the films are very irregular in form. This Torula 

 produces only 1 per cent, (volume) of alcohol in wort, does not 



