CHAPTER IV. 
TO PRESERVE INSECT PARASITES. 
In collecting specimens place them in a bottle 
containing a piece of gum camphor. After the in- 
sect is dead it can be mounted on a block of wood 
by means of a pin thrust through the thorax. Dark 
or black parasites should be mounted on a light 
back-ground. These can be placed in suitable 
bottles with moth ball or gum camphor, and will keep 
indefinitely. Another way is to fill the bottle with 
alcohol. This forms a good preservative and does 
not rust the pins. 
TO MOUNT ECTOZOA. 
1. Wash in alcohol till all dirt is removed from 
the parasite. 
2. Place specimen in xylol for five minutes. 
3. Mount in Canada balsam. 
By this method lice, gnats, parts of flies, ticks, and 
scab parasites can be satisfactorily studied. Thus 
preserved the specimen will keep indefinitely. In 
mounting thick specimens the glass or rubber, cells 
may be used. Keep slide face up, as .in the stimmer 
the Canada balsam will become soft and the speci- 
men gravitate to one side if the slide be kept edge- 
wise. 
TO PRESERVE ENTOZOA. 
1. The Keiserling method may be used. 
2. A four percent solution of formalin. 
3. Alcohol. 
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