STUDIES ON FERMENTATION. 



173 



Some spontaneous yeast which, after repeated cultivation, had 

 acquired the aspect represented in Plate XI. — which aspect the 

 saccharomyces pastorianus generally assumes under these circum- 

 stances — was exhausted in sweetened water, and subsequently 

 revived in must at 10° C. to 11° C. (51° F.). At this tempera- 

 ture germination was not very marked before the end of eight 

 days ; at a temperature of 20° C. (68° F.), it only took three 

 days, under similar conditions. The sketch includes but one 



EiG. 33. 

 of the long branches from which the ferment cells and the 

 budding joints took rise, but there were a great number more. 

 Some of the forms represented in the figure bear a striking 

 resemblance, it appears to us, to some of those of dematium, in 

 Plate IX. ; and even we may trace out the several peculiarities 

 of form which distinguish the figures in the latter plate. 



The next figure (34) represents the earliest forms of ger- 

 mination of another speciuien of saccharomyces jjastorianus in 



