I. 



MICROSCOPY. 



CHAPTEE I. 

 THE MICROSCOPE AND ACCESSORIES. 



The microscope is a lens or combination of lenses designed to aid 

 the eye in the examination of minute objects. 



KINDS OF MICROSCOPES. 



There are two kinds of microscopes, simple and compound. A 

 simple microscope is a single lens (or group of lenses) which is so 

 used that the object to be examined is between the focus and the 

 lens. It produces an erect virtual image. A compound microscope 

 is a combination of lenses, by means of which an inverted image is 

 produced, and this is viewed by the eye, not the real object. 



STRUCTURE OF THE COMPOUND MICROSCOPE. 



The following parts should be carefully studied, and the use of 

 each part thoroughly understood: 



The base rests upon the table and supports all the other parts. 



The pillar is the upright column which supports the arm. 



The arm is attached to and works upon the pillar by means of 

 the hinge-joint. 



The reflector is the mirror by which the object to be examined is 

 illuminated. 



The stage is the platform upon which rests the slide containing 

 the preparation to be studied. Clips are springs attached to the 

 stage to hold the slide in position. 



The aperture is the circular opening in the stage. 



The diaphragm is the circular disk which regulates the amount 

 of light required for illumination. 



The body is the cylindrical attachment supported by the arm. 



The draw-tube is the tube which moves within the body. 

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