THE MIOROSCOPl 



25 



as 

 to 



instances in -whicli it can be said to furnisli a 

 means of distinguishing one object from the other. 

 It may, therefore, be left to the time when the 

 observer has gone through some little practice with 

 his instrument, and is inclined to buy the necessary 

 apparatus. 



Having said thus much 

 with regard to apparatus, we 

 will now give some direc- 

 tions for the use of the Mi- 

 croscope under ordinary cir- 

 cumstances. The Microscope 

 may be either used by the 

 light of the sun in the day- 

 time, or at night by some 

 form of artificial light. It 

 is best used by daylight, 

 artificial light is likely 

 tire the eyes. 



Having determined to 

 work by daylight, some spot 

 should be selected near a 

 window, out of the direct 

 light of the sun, in which to 

 place a small, firm, steady 

 table. On this the Micro- 

 scope should be placed, and 

 the object-glass should be 

 screwed on to the tube. The 

 mirror should be then ad- 

 justed so as to throw a 

 bright ray of light on to the 

 object-glass. The eye-piece 



having been previously placed 2. Dipping Tube«. 



at the top of the tube, the 



Microscope is now ready to receive a transparent 

 object. If the object to be examined is an animal- 



