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COLLECTING AND PRESEEVING INSECTS RILEY. 



111. It is constructed of strong pasteboard and is arranged for holding 

 twenty-six slides. The cover bears numbers from 1 to 26, opposite 

 which the name of each insect mounted, or the label on the slide, may 





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Fig. 110. — Balsam mount, showing method of labeling, etc. (original). 



be written. This box when not in use is kept in a pasteboard case, 

 on which may be placed the number of the box. These slide cases 

 may be stored in drawers or on shelves made for the purpose. In 

 mounting specimens taken from alcohol it is advisable to put a drop of 



Fig. 111.— Slide case, showing method of labeling case and of numbering and labeling slides (original). 



oil of cloves upon them, which unites with the balsam and ultimately 

 evaporates. The occurrence of minute air bubbles under the cover- 

 glass need occasion no uneasiness, for these will disappear on the 

 drying of the balsam. 



In mounting minute Acarids or mites it has been found best to kill 

 the insects in hot water, which causes them to expand their legs, so that 



