PART II. 
STUDY AND CULTIVATION OF BACTERIA 
Exercise 1. Construction and Operation of the Microscope 
MATERIALS: 
A compound microscope completely equipped 
A test object mounted on a slide 
1. The type of compound microscope used in bacteriological work repre¬ 
sents the highest development in the fields of optics and mechanics. The 
mechanical parts are easily injured; the lenses, especially those giving great 
magnifications, are delicate and expensive. The instrument should be han¬ 
dled with care. 
2. Notice that the compound microscope (Fig. 1) is provided with a foot, 
A; arm, B; stage, C; tube, D; nose piece, E; objectives, F and G; Abbe condenser, 
H; iris diaphragm, I; ocular, J; mirror, K; coarse adjustment, L; and fine adjust¬ 
ment, M. 
FIG. 1-CONSTRUCTION OF THE COMPOUND MICROSCOPE 
