CASES. 77 
room. ‘The specimens may be kept flat in drawers sliding in 
aframe or in trays piled one on another and enclosed in a 
lizht 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 asaw. Ina 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. 
