STUDIES OF ANIMAL LIFE. 



PRELIMINARY EXERCISES. 



1. THE COMPOUND MICROSCOPE. 



A. Parts. 



The compound microscope consists of two parts, 

 the mechanical part (stand) and the magnifying 

 part (lenses). 



B. Stand. 



1. The base, the part which rests on the table. 



2. The vertical column, attached to the base and sup- 



porting the other parts. 



3. Tlie stage, a horizontal shelf attached to the ver- 



tical column. Wh'at is the use of the opening in 

 the center of the stage ? 



4. The rotary disk, with openings of different sizes, 



fastened to the under side of the stage. What is 

 its use ? 



5. The mirror, attached to the vertical column below 



the stage. What is its use ? In how many direc- 

 tions can it be turned ? 



6. The sliding tube, held in a sleeve, which is in turn 



connected with the upper part of the vertical 

 column. 



