Bui. 76, Bureau of Entomology, U. S. Dept. of Agriculture. 



Plate IV. 



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Fig. 1.— Commissary Tray: Open Compartment (Tin Lined) for Cyanid at Right, 

 Balances and Torch in the Middle, Compartment for Acid Pitchers and 

 Glass Graduate at Left. Fig. 2.— Top of Derrick, Showing Method of 

 Attaching Pulley and Guy Rope. Fig. 3.— Base of Derrick, Showing Method 

 of Constructing Braces. (Original.) 



