50 



THE MICROSCOPE AND ITS REVELATIONS. 



forceps, and with metal and glass stage-plates; a dissecting-trough, lined 

 with cork, also fits into the opening of the stage. The Simple Micro- 

 scope, as used for dissecting and mounting, is shown in the lower figure; 

 it has two powers used singly or in combination, which are carried by the 

 smaller arm of the stand. The Compound body, as shown in the upper 

 figure, screws into the larger arm of the stand, and has a divided objective, 

 giving a range of three powers; the nose is made with the standard screw, 

 so as to fit any first-class objectives. A telescope sliding arm, fitting into 

 a socket on either side of the stage, can also be used to carry the simple- 

 microscope powers, as well as a larger low-power lens, that serves also as a 



Field's Dissecting and Mounting Microscope. 



hand-magnifier; and the arm can be readily fixed in any desired position 

 for examining objects away from the instrument. A watch-glass holder 

 used upon the glass stage-plate, gives the means of sliding steadily upon 

 the stage in any direction objects that are under examination in a watch- 

 glass. A turn-table for mounting purposes is carried upon a long~spindle 

 that works through the corner of the stage (as shown in the lower figure), 

 the arm of the stand serving as a support for the hand whilst using the 

 turn-table; the top is made of the size of an ordinary glass slide, and the 

 slide is held upon it by an india-rubber band. A hot plate fits into the 

 opening of the stage, and is heated by a spirit-lamp placed in the posi- 

 tion of the mirror, which is then turned to one side; and the larger arm 



