48 HISTOLOGY OF MEDICINAL PLANTS 
number, and the box, the tray or cabinet number. For 
example: 
Powdered Arnica Flowers 
No. 80—Box A—600. 
PRESERVATION OF MOUNTED SPECIMENS 
Accurately mounted, labeled, and ringed slides should be 
filed away for future study and reference. Such filing may 
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Fic. 53.—Slide Tray 
be done in slide boxes, in slide trays, or in cabinets. Slide 
boxes are to be had of a holding capacity varying from one to 
