MICROCOCCUS AND SARCINA 47 



EXERCISE XVI 



THE MORPHOLOGY OF MICROCOCCUS (STAPHYLOCOCCUS 

 FORM) AND SARCINA 



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

 scribe the cultu^pmade 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 f 

 I preparation, and measure with the filar micrometer a few ( 

 \jndividual 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 cloaca (or other actively motile forms). 



Bacillus lactis viscosus. tjO^--;LXi^ ^^k^.^.!^_'\^ .i^^^^/vvJLH'y 



Bacillus subtilis. 



