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. 
Fic. 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 
