79 



be made permanent by placing a ring of asphalt, with the 

 aid of a turn-table, around the edge of the cover-glass. 



Make Petri dishes of white yeast; Esmarch roll tubes 

 of red yeast and of black yeast. 



Examine baker's or brewer's yeast (Saccharomyces 

 cerevisise) in hanging drop and in stained preparations. 

 Observe the form and structure of the yeast cell and the 

 method of multiplication by budding. 



