MICROSCOPE T.AMPS. ll 



over the hole in tlie diaphragm, send the light 

 through it, and the result will be a very soft 

 agreeable effect, well suited for many purposes, such 

 as viewing sections of wood, insects mounted whole, 

 after being rendered transparent, many small water 

 creatures, etc. Another mode of accomplishing this 

 pur[)ose is to ])lace a similarly prepared disk of 

 paper on the Utit side of a bull's-eye lens, and 

 transmit the light of a lamp through it. This 

 plan may be used with higher powers, and the 

 white o[)a(|ue light it gives may be directed at 

 any angle by means of the mirror beneath the 

 sta«rc. 



An ordinary lamp may be made to answer for 

 microscopic use, but one of the small paraffine 

 lamps, now sold everywhere for eighteen-pence, is 

 singularly convenient. It is high enough for 

 many purposes, and can easily be raised by one 

 or more books. That used by the writer has a 

 small silvered reflector behind the flame, which is 

 serviceable when much light is required. 



Many people fancy that the eyes are injured by 

 continual use of the microscope, but this is far 

 from being the case if reasonable precautions are 

 taken. The instrument should be inclined at a 

 proper angle, all excess of light avoided, and the 

 object brought into focus before it is steadily 

 looked at. Most people solemnly shut one eye 



