MICROSCOPIC OBJECTS. 149 



thirdly, cover the top with a similar paper, but of a dif- 

 ferent colour ; and lastly, paste on a label with the name 

 of your object. A neat and excellent cover for the 

 upper side of your slide is the engine-turned pattern given 

 at the end of this little book. It is a purple paper 

 printed with a gold pattern, Tlie centre is to be punched 

 out for the object, and the square blank near one end is 

 to be cut out to receive the name. For this purpose a 

 white paper label had better be pasted on the slide before 

 the cover. These plates, each having six labels, may be 

 purchased by the dozen or hundred as may be most con- 

 venient. 



(11.) Mounting Opaque Objects. — The above engravings 

 represent three methods of mounting microscopic objects 

 to be viewed by reflected light. The first figure on the 

 right hand represents a disc of leather, felt, or other 

 suitable material, about f or ^ an inch in diameter, with 

 a pin passing through it as seen in the drawing. The 

 side for holding the object is to be blackened; the other 

 side is covered with white paper on which the name is to 

 be written. The middle figure represents another plan 



