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. 
My 
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 
