Bui. 316, U. S. Dept. of Agriculture. 
Plate VIM, 
P-I6787A 
Fig. 1.— The Mat as it nears Completion, 1,000 Feet Long and 250 Feet Wide. 
F-16792A 
Fig. 2.— Sinking the Mat by Throwing Rock Ballast on It. 
BANK-REVETMENT WORK. 
