CASES. 77 



room. The specimens may be kept flat in drawers sliding in 

 a frame or in trays piled one on another and enclosed in a 

 li^ht box ; the former is the most convenient, the latter the 

 more compact. 



When slides stand on their edges they are supported in the 

 box by strips of wood in which transverse grooves are cut 

 with a saw. In a box of this character many slides may be 

 packed in a small compass. Another method which has been 

 proposed is to take the frame of an ordinary school slate and 

 replace the' stone with pasteboard. Rubber cord is then sewed 

 through the pasteboard forming clips which support the slides. 

 Several of the frames are bound together in book form and 

 placed on the shelves. 



The forms of cases above described will answer in the 

 majority of instances, but occasionally circumstances will de- 

 mand something different. No rules can be laid down to 

 cover every condition which may arise ; a use of common 

 sense and ingenuity will solve most difficulties. 



