Bui. 664, U. S. Dept. of Agriculture. 



Plate II. 



Fig. 1.— Step Load, Placed from Ends, Center Spaces Filled with Strav/. 

 Work Unusually Well Done. 



Fig. 2.— Step Load, Placed from Ends. Confusion at the Center, and Spaces 

 Loosely Filled wth Straw. 



