24 



ELEMENTS OF APPLIED MICROSCOPY. 



pillar is provided with a joint for that purpose; and if 

 the instrument is kept upright, the spring clips may be 

 dispensed with, the object being moved about on the 

 stage as desired. 



Fig. 17. — Proper Position for Observer. (After Bausch.) 



The lenses of the microscope should always be exam- 

 ined before they are inserted in order to see if they re- 

 quire cleaning. Since the glass is easily scratched, only 

 soft clean cloth or, better still, Japanese lens-paper is 

 suitable for this purpose; the fingers, which are always 



