OF MICROSCOPIC OBJECTS. 41 



Mr. J. B. Spencer's model is made thus : It is formed 

 of thin sheet steel (obtainable at any instrument maker's), and 

 cut out in one piece, of the form above, with a stout pair of 

 scissors, and then bent the required shape with a pair of 

 pliers. When used, the fore and middle fingers are applied 

 on the under side, and the thumb on the spring. If great 

 pressure is required, two clips may be used, one at each 

 end of the slide, and for any delicate work the width, of 

 the steel can be reduced. 



STEEL CLIP. 



The American wooden spring clips are occasionally very 

 useful, and wire clips of the kind described by Dr. Carpenter 

 are now commonly sold and are indispensable. 



Common watch-glasses should always be kept at hand. 

 They are certainly the cheapest, and their transparency 

 makes them very convenient reservoirs in which objects may 



