402 



STATE BOARD OF AGRICULTURE. 



TABLE IX. 



*Ga3. 



ring. 



THE YEASTS. 



For the classification of yeasts we did not find any convenient system 

 and therefore made the groups according to morphology and physiology 

 without naming them. 



In isolating the yeasts from the original agar plates we made the distinction 

 between the following four groups: 



1. Round, smooth, glistening (surface colonies). 



2. Small, star-shaped (below surface). 

 '3. Large, dull, convex. 



4. Pink. 



From the agar plates the yeasts were isolated into broth, and after 1 or 

 2 days, plated in ordinary gelatin. The forms of the gelatin colonies of the 

 first two groups were so different that it seemed at first possible to classify 

 the yeasts according to the shape of the colonies. We could distinguish 

 the perfectly round type, the irregular type with granulated edges, and two 

 branching types, one with filamentous branches and another with thick, 

 finger-shaped branches. But these types were not strictly limited, some 

 of the yeast colonies were links between different types, and a few others 

 gave two different types of colonies on the same gelatin plate. 



We had more success with the morphology of the yeasts determined from 

 the slant lactose agar cultures. It was possible to recognize a type of a 

 small, irregular elliptic or oval yeast, and to place about 100 of the cultures 

 in this one group. There were slight differences between some cultures, 

 but in general there was enough similarity to allow of this. This group is 



