Vol. IX] TAYLOR— COOPER'S MAMMALS 73 



closed in 1866, when he settled down to the practice of his 

 profession at Santa Cruz, California. In the year 1871 he 

 located in Ventura County, where he remained until 1875. He 

 then moved to Hayward, California, where he resided until 

 his death on July 19, 1902. 



A biographical account of Dr. Cooper has already been pub- 

 lished (see Emerson, 1899 and 1902) ; it will nevertheless be 

 profitable, so far as accessible records will permit, to make 

 note of his movements year by year during the period when 

 he was most active as a collector. 



Dr. Cooper was assigned to the western division of the 

 Pacific Railroad Survey Expedition to which allusion is made 

 above, serving as surgeon and naturalist under Captain, later 

 Major General, George B. McClellan. Cooper left New York 

 May 5, 1853, in company with Lieutenant J. K. Duncan, re- 

 porting to Captain McClellan at Fort Vancouver, Washing- 

 ton Territory, on June 14, having made the trip by way of 

 Panama. The expedition was organized at Fort Vancouver, 

 and the actual exploration began July 18, 1853. The work 

 was carried forward until the middle of the following Novem- 

 ber, the country traversed including the Klickitat Pass region 

 between Mt. St. Helens and Mt. Adams, the eastern side of 

 the Cascade Mountains, the Yakima Valley, the Okanagan 

 River north at least to Lake Oyosa [= Lake Osoyoos] (see 

 Cooper, W., 1860, p. 378), the Colville district, the Spokane 

 Plains, and the vicinity of Fort Walla Walla. On November 

 15 the party reached Fort Dalles, Oregon (Suckley and 

 Cooper, 1860, p. x), returning to Fort Vancouver soon 

 thereafter. 



The published writings of Dr. Cooper indicate that he made 

 his headquarters at Fort Vancouver for nearly a year or until 

 February 20, 1854, At this time he traveled to the mouth of 

 the Columbia River^ (1860a, p. 33), remaining there and at 

 Shoalwater Bay during the following spring. On March 26, 

 1854, Cooper made an excursion in a sailboat up the "Willo- 

 pah," [=Willapa] a river which empties into the north end of 

 Shoalwater Bay (1860a, p. 20). Specimens are on record 

 (Baird, 1858, pp. 777, 916) which he collected at Steilacoom 

 in March and April of this year. 



' Specimens were collected at least at the Mouth of the Columbia, March 2 and 9; 

 and Cape Disappointment, no date given (Baird, 1859, pp. 805, 882). 



