196 



MICRO-ORGANISMS AND FERMENTATION 



sixteen days at 15 C., give growths with distinctly hairy 

 edges}" 



1 To the Pastorianus group also belongs the "Logo* yeast," described by VAN 

 LAER, a rapidly clarifying low-fermentation yeast, indigenous to Brazil. 

 During fermentation its cells collect together in bulky, ramified agglomera- 

 tions, which settle on the bottom and walls of the fermentation- vessels. The 

 Logos yeast ferments very slowly, but produces, by degrees, very high per- 

 centages of alchohol. According to ROTHENBACH, this species is able to 

 ferment about half the total quantity of a diastase-dextrine, prepared according 

 to LTNTNER'S directions, but may be distinguished from the Sacch. Pombe, 

 described below, by fermenting species of dextrine not attacked by the latter. 



