292 



THE MONTHLY BULLETIN. 



GLASS TUBES. 



Scale insects {Coccida) are easily handled and preserved in small 

 olass shell vials, as shown in Fig. 298. Life histories of other insects for 

 exhibition purposes may also be mounted in small or large glass tubes. 



Fig. 293. — Speci- 



mens of scale insect 

 in a glass vial. (Cal. 

 Hort. Com.) 



PLAQUES OR GLASS MOUNTS. 



Nearly all insects may be mounted in plaques with glass facing 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 fitted with a glass faced 

 cover. 



GLYCERINE. 



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

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

 glycerine prepared by adding one part of acetic acid to ten parts of 

 glycerine jelly. Specimens may be mounted directly into this or 

 previously prepared as directed for mounting in Canada balsam. 



