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 



FIG. 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 



