CONTROL OF THE HOUSE FLY AND RELATED FLIES 159 



ft. ^f'— .?"*^ 'H^ 



Plate VIT. — Road drag in use scraping manure in a cow lot on a Tennessee farm. 

 (Bishopp.) 



Plate VIII. — Undesirable conditions wiiich are overcome i)y use of the Tuasigot traji. 

 A manure pile covering a large area and having little depth. Illustrating the 

 conditions which favor the greatest loss of nitrogen, and at the same time offer 

 the best breeding ground for flies. (Hutchison.) From U. S. Dept. Agr. Bull. 

 200, Plate III. 



