72 NATURALISTS’ ASSISTANT. 
Insects are placed on exhibition in trays which are placed 
in horizontal cases. ‘These trays are made of light wood and 
should be about ten by twelve inches by two deep. The 
bottom should be lined with sheet cork, which may be 
procured of any dealer in Naturalists’ supplies, and over this 
should be stretched paper so that the whole will present a 
neat appearance. Prof. E. S. Morse has described in the 
Fic. 25. 
pages of the American Naturalist a convenient substitute for 
cork in the bottoms of cases. A rectangular frame of light 
wood strips of such a size as to be readily admitted into the 
tray has stretched upon it sheets of paper, one above and one 
below. ‘The paper may be readily stretched by thoroughly 
wetting it and while wet gluing it to the frame. Thus, when 
dry it is as tight as a drum-head. ‘This papered frame should 
be supported about an eighth of an inch above the bottom 
