PLATE 37 



a. Work of Yellow-haired Porcupine on branches of prostrate lodgepoh^ pine. Photo- 

 j^raphed at Porcupine P'lat, SlOO feet altitude, July 1, 1915. See text, \k 1o3. 



J). Dam made by Golden Beaver in slough formed by gold dredger in the Merced 

 Eiver bottom near Snelling. Photograph taken January 9, 191o. Altho.igh small, this 

 dam shows typically the method of construction employed by this rodent. See text, 

 !>. 21 (i. 



[7 10 I 



