xii THE COMPOUND MICROSCOPE. 
3. Obtain good light by using the mirror. 
4. Focus by means of the “coarse adjustment and fine 
adjustment.” 
5. Adjust the object in the “field of vision.” 
6. Regulate the amount of light by means of the mirror 
and rotary disk. 
Notse 1.— Small printed letters, or even whole words, 
mounted on a glass slide, are desirable in a preliminary 
study as to the use of a microscope. Get the light and 
focus several times until you have perfect control of all 
the microscope parts. 
Note 2.— Whenever the microscope is used, and the 
study and desirable drawings are completed, carefully 
arrange the microscope and all its parts ; also return the 
preparation where requested by the instructor. Or, if it 
is a temporary preparation, as is commonly the case in 
everyday work, very carefully clean the slide and cover 
glass, and place them in good order where requested by 
the instructor. 
