DAIRY BACTERIOLOGY 



79 



EXERCISE XIX 



DAIRY BACTERIOLOGY 



Examine microscope carefully under the direction 

 of the instructor and ascertain difference between 

 high and low power objectives with different eye 

 pieces. Manipulate reflector, condenser, and dia- 

 phragm to ascertain various combinations. 



FIG. 41 



The above cut represents a portion of a drop of 

 milk containing F, fat globules, L, leucocytes, Y, 

 yeast, and B, b, c, s, T, 1 and 2, seven species of 

 bacteria frequently found in milk. B represents 

 the hay bacillus group which are among the largest 

 known species of bacteria, and frequently form 

 chains; b represents one species of bacillus viscosus 



