MICROCOCCUS AND SARCINA 47 



EXERCISE XVI 



THE MORPHOLOGY OF MICROCOCCUS (STAPHYLOCOCCUS 

 FORM) AND SARCINA 



72. Work for this Exercise. — Carefully examine and de- 

 scribe the cultures made in Exercise XV. 



Prepare and examine a hanging-drop preparation, and a 

 stained (aqueous solution of methyl-violet) cover-glass prepara- 

 tion from each culture. Describe carefully the bacteria in each 

 preparation, and measure with the filar micrometer a few 

 individual organisms in each of the stained preparations. 



Preserve a stained cover-glass preparation of each genus of 

 bacteria to accompany notes. • (If preferred, the student may 

 use any of the other stains for the permanent mount.) 



Include in the notes the generic characters of each of the 

 genera studied in this exercise. 



Inoculate a tube of bouillon and one of agar from a culture 

 (furnished) of each of the following bacilli, viz. : — 



Bacillus cloaccB (or other actively motile forms). 

 • Bacillus lactis viscosus. 



Bacillus subtilis. 



