INJURIOUS AND BENEFICIAL INSECTS OF CALIFORNIA. 



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PLAQUES OR GLASS MOUNTS 



Nearly all insects may be mounted in plaques with glass fronts and 

 cardboard backs. These make excellent exhibits to hang upon the walls. 

 Special mounts are prepared in the form of small cardboard boxes filled 

 with cotton upon which the specimens rest and over which a glass-faced 

 cover is tightly fitted. 



GLYCERINE 



Certain small soft-bodied scale insects, plant lice, young bugs, larvae 

 etc., are often mounted directly on glass slides under a glass cover in 



glycerine prepared by add- 

 ing one part of acetic acid 

 to ten parts of glycerine 

 jelly. Specimens may be 



Fig. 501. — Method of labeling insect boxes. 

 The cards may be taken out at will. The family 

 and generic names appear on the outride. 

 (Original) 



Fig. 502. — Method of pre- 

 serving scale ins. rls in glass 

 vials. Natural size. (Original) 



mounted without killing or clearing into this or prepared as directed 

 for mounting in Canada balsam. 



CANADA BALSAM 



For microscopical study, scale insects, plant lice, thrips, mites, etc., 



are. permanently mounted on slides in Canada balsam which lias I n 



dissolved in xylol. Specimens are mounted directly in the balsam, 

 either alive or" freshly killed, and when so done usually retain their 



