112 LABORATORY EXERCISES. 



52. RULES FOR THE USE OF THE COM- 

 POUND MICROSCOPE. 



I. To lift the microscope, always grasp it firmly by 



the pillar beneath the stage. 



II. To use the low power-objective. 



1 . Place the stand so the two arms of the base 



face the window. Keep the microscope 

 out of the direct sunlight. 



2. See that the nose-piece is in the position 



which will bring the low-power objective 

 over the opening in the stage. 



3. Move the tube up or down by the coarse ad- 



justment until the lower end of the low- 

 power objective is a little more than a 

 quarter of an inch above the level of the 

 stage. 



4. See that the plane side of the mirror is fac- 



ing the source of light. Looking down 

 through the tube, move the mirror about 

 until the field of the microscope has the 

 best possible illumination. (The field of 

 the microscope is the lighted circular 

 area which appears when looking down 

 through the tube.) 



5. Place the slide on the stage (cover-glass on 



top) in a position so the object to be ex- 

 amined is over the centre of the hole in 

 the stage. Fix the slide in place with 

 the clips. 



6. Look through the microscope and slowly 



