j|. 118, U. S. Dept. of Agriculture. 



Plate II 



Destruction of Fly Larv/e in Horse Manure. 



Cage used in the chemical treatment of manure, showing the flytraps at the top, the small door 

 al the side through which samples of manure can be removed, the pan for collecting drip 

 water, and other details of the structure. (Original.) 



