ROC. Wash. Acad Sci. Vol. VI. 



Plate XXVII. 



!(.. I. Slate River Vallev. The liea\er da^l^ are hevoiui the fence and are oliscureii h\ tlie willow: 



riiotos E. K. w. 



IG. 2. Beaver dams across Shite River, from north end. Tiie end of the short dam helow can be seen. 



