Bui. 790, U. S. Dept. of Agriculture. 



PLATE XVIII. 



Fig. 1. — Salt log used on cattle range of Whitman National Forest. Smooth, twisted ■wire 

 stapled every 4 inches is used, as shown, to protect the trough from gnawing by horses 

 and porcupines. 



F-»7 2I2-A 



Fig. 2. — Where block salt is used one cow may monopolize a block for an hour, forcing the 

 other animals to wait their turn. 



