SUGARS SUSCEPTIBLE OF FERMENTATION. 515 



stances, and of yeast Isevulan (see p. 175, vol. ii.). It is fermented 

 by all organisms capable of fermenting d-glucose, with the single 

 exception of a film yeast, LINDNER'S No. 178 (XLII.). 



Only the above four hexoses (c/-glucose, d-mannose. cZ-galactose 

 and ^-fructose) are fermented by yeasts, all the others being un- 

 fermentable. 



