Bui. 90, Part I. Bureau of Entomology, U. S. Dept. of Agriculture. 



Plate 



Fig. 1.— Brick Furnace, Tank, and Derrick Used in the 

 Tannin Treatment of Tents to Prevent Mildew, 

 San Bernardino County, Cal. (Original.) 



Fig. 2— Machine for Covering Tree with Sheet Tents. Devised by C. E. 

 McFadden, of Fullerton, Cal. (Original.* 



