LIVING BODIES AND CELLS 17 



A compound microscope consists of two lenses set in a 

 movable tube. The lower lens is called the objective, and 

 does the main part of the magnifying. It can easily be 

 removed from the tube or swung aside, and another 

 objective of different magnifying power substituted for it 



EYEPIECE 



COARSE ADJUSTMENT 



FINE 



MIRROR 



FOR LIOHTIN9 



SPECIMEN- 



Compound microscope. 



The upper lens is called the eyepiece. It can be re- 

 moved from the tube, and another substituted. Usually 

 two or three objectives and two eyepieces of different 

 magnifying powers are furnished with each microscope. 

 A microscope is said to magnify as many diameters as 

 the number of times it enlarges the breadth or diameter 



OV. PHYSIOL. 2 



