PART II. 



THE USE OF THE MICROSCOPE 



POSITION 



In choosing a place to work one should select a com- 

 fortable position where he can obtain the best light 

 available and have room for his microscope and neces- 

 sary accessories and reagents. There is some controversy 

 in regard to the using of the inclination joint. There is 

 no harm in using it if it is more comfortable to do so. 

 If one is working with fresh mounts or fluids, the hori- 

 zontal stage is necessary. Because such preparations are 

 so often used in the laboratory, it is best for one to train 

 himself to use the microscope with the tube in the per- 

 pendicular position and make it a rule to keep it in that 

 position. 



Make it a rule to work with both eyes open, and if 

 possible, use either eye interchangeably. A very little 

 practice will enable one to do so. By paying attention 

 to this and proper lighting, there is no reason why any 

 reasonable amount of work with the microscope should 

 injure the eyes. 



LIGHT 



The best light is obtained from white clouds, although 

 some authorities claim that the light from the blue sky 

 is best. Avoid the use of direct sunlight. If the room 

 is so situated that the sun shines in, use white shades to 

 modify the sunlight. If possible, select a window which 

 is free from cross bars, wire nettings, etc., and which is 

 some distance from swaying branches of trees. 

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