THE MICROSCOPE. 



27 



or by a pair of small forceps. (Fig. 8.) Some trans- 

 parent objects may be seen without any medium, 

 but generally it is best to place them on the slide 

 with a drop or two of clean water, which may be 

 placed on it with a dipping-tube. When water is 

 used, it will generally be found best to cover the 

 object with a small piece of thin glass. Small 

 square pieces of thin glass are sold at all the 

 opticians' shops for this purpose. The object is 

 then placed under the object-glass as before. 



In order to render objects 

 transparent, so that they may 

 be viewed by transmitted light, 

 very thin sections of them 

 should be made. This may be 

 effected by means of a very 

 sharp scalpel, or a razor. "When 

 objects are too small to be held 

 in the hand to be cut, they 

 may be placed between two 

 pieces of cork, and a section of 

 them made at the same time 

 that the cork is cut through. 



Sometimes it is found desir- 

 able to unravel an object under 

 the Microscope. If this is the 

 case only a low power should 

 be used, and the object may be 



slide, with- 



placed on a glass 



out any 



glass 



over, and two 



needles with small wooden han- 

 dles employed — ordinary sew- 

 ing needles, with their eyes 

 stuck in the handle of a hair 

 pencil, will answer very well. 

 (Fig. 14.) Even when dissection is not to be carried 

 on under the Microscope, a pair of needles of this 



Fig. 14. 

 Dissecting Needles. 



