THE MICROSCOPE. 



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easily in the inside of the body to form the stage. One of 

 these plates, F, is bent semicircularly in the middle, for the 

 reception of a tube of glass, for viewing the circulation of the 



Fig. 3. 



blood in small fish, while the other two are flat, and between 

 these last the object-sliders, K, are introduced. Between the 

 stage and the end of the body, B, is a bent spring of wire, H, 

 to keep the stage and object steadily against the screw-tube. 

 The object is adjusted to the focus by turning the screw D. 

 This instrument was held in the hand in such a position that 

 the light of a lamp or candle might pass directly into the con- 



