December 1956 ARS-33-35 
United States Department of Agriculture 
Agricultural Research Service 
A SIMPLE DEVICE FOR 
DETERMINING INSECT DAMAGE TO SEEDS 

AG MENT FA La 
~~ LIBPA RY %, 
By J. R. Douglass and K. E. Gibson {: fe> “e572 
Entomology Research Branch \. Se, ——0—— ce 
i TSV. Le BRAT 
A simple device for determining insect damage to seeds is 
described, which is inexpensive and easy to uSe, and speeds the 
examination of large vegetable seeds, such as beans, corn, and peas. 
Since the operator can see both sides of the seeds at once, he does 
not have to roll them. 
A pane of window glass 15 to 18 inches square is set on three or 
four wooden legs 13 inches square and 4 or 5 inches long, or on suit- 
able wide-mouthed glass bottles. A small household magnifying mirror 
53 inches in diameter, mounted in a wire holder with a simple wire 
base, is placed under the glass and swiveled until its surface is at 



