Class.— FUNGI. 



0]?dei? X.— S£i.ccli.£i>i?onAycetes. 



Type.— YEAST (Torula) Sacoharomyces Cerevisise. 



Small round or ellipsoidal cells, having a diameter 

 of about '0003 of an inch. Each cell is an individual 

 plant which lives an isolated life. 



STRUCTUKE. 



A thin, smooth, cellulose wall encloses a cavity 

 filled with protoplasm, and one or more vacuoles. 

 According to Stras burger a nucleus is always 

 present, but nuclear division has not yet bee a 

 observed. The cell wall is very rarely coloured blue 

 by iodine and sulphuric acid, and is considered a 

 special modification under the name t)f fungus 

 cellulose. Starch and chlorophyll are never present, 

 the characteristic contents being a fatty oil. The 

 protoplasm consists of proteids, the chief being 

 '' Protein," a compound analogous to Casein. 



The chemical elements present in (1) Cellulose, are 

 Carbon, Hydrogen, Oxygen ; (2) Protoplasm, are 

 Carbon, Hydrogen, Oxygen, Nitrogen and Sulphur. 



