266 CABINETS AND TRAYS FOR PREPARATIONS \CH. IX 



(5). On the front of each drawer should be the number of the drawer in 

 Roman numerals, and the number of the first and last compartment in the 

 drawer in Arabic numerals (Fig. 211). 



FIG. 212. Trays for slides and for ribbons of sections. The figures show 

 the construction. It is important to have the bordering frame with rounded 

 corners so that the trays may be easily pulled out of a pile or reinserted. The 

 screw eye shown in A makes it easy to pull out a single tray. For ribbons of 

 sections a piece of paper is placed in the tray and the ribbons are placed on it. 

 (A) Face view, (B) Sectional viezv of the whole tray, (C) Sectional view of one 

 side (natural size) to show the construction more clearly. These trays arc 

 about 30 .v 44 centimeters ( n 3-4 x ij 1-4 in. ) , and hold 50 / x j /;/. slides, i. e. , 

 5 rows 10 in a row. Trays of this kind are so cheap ($17.50 per hundred for 

 those holding 50 to 60 slides), that a laboratory can have all that are needed. 

 (Trans. Amer. Micr. Soc., 1899, p. 107.) 



371. Trays for Slides and Ribbons of Sections. Early in 1897 the 

 writer devised the simple tray shown in Fig. 212. It was designed especially for 

 the ribbons of sections in preparing embryologic series and for material for 

 class work. As will be seen by the figure the two sides are alike and the tray 

 is very shallow. It was soon found that the wood forming the bottom, of the 

 tray was too rough for ribbons of sections and smooth white paper was put in 

 the tray before the ribbons were laid upon it. 



These trays were soon used for the mounted preparations as well as for the 

 ribbons of sections. They were made of a proper size to fit the laboratory 

 lockers (Fig. 214); and naturally came to be used for storage instead of the 

 expensive slide cabinets shown in Figs. 210-211. For this purpose five could 

 be put in a single compartment of the locker or 35 in an entire locker. As 

 each tray holds fifty slides I x 3 in; 37, 1^x3 and 25 slides 2x3 in., the sav- 

 ing of space was very great. 



