HOW TO MOUNT SPECIMENS 49 
one hundred slides. For general use, slide boxes (Fig. 52) hold- 
ing one hundred slides will be found most useful. Some workers 
prefer trays (Fig. 53), because of the saving of time in selecting 
specimens. Trays hold twenty slides arranged in two rows. 
The cover of the tray is divided into two sections so that, if 
Fic. 54.—Slide Cabinet 
desired, only one row of slides is uncovered at a time. Slide 
cabinets (Fig. 54) are particularly desirable for storing large 
individual collections, particularly when the slides are used 
frequently for reference. Large selections of slides should be 
numbered and card indexed in order to facilitate finding. 
