108 THE OSPREY. 



residence at Hay ward (Alameda County), California, on the 19th of July, 

 1902. He had completed his seventy-second year and one month of the 

 seventy-third. 



The likeness in the plate is reproduced from a photograph taken while he 

 was at work on his volume on his volume on the Birds of California. — Editors. 



In 1851 he was graduated from the College of Physicians and Surgeons, 

 New York, following it by a two years' course in the city hospitals. In 1853 

 he was appointed surgeon to the northern division of the Pacific Railroad Sur- 

 vey, at the suggestion of Professor S. F. Baird, and spent some time at the 

 Smithsonian Institution, preparing himself for the duties of naturalist as well 

 as medical adviser to the party. He was one of the original group of young 

 naturalists which gathered around Professor Baird in the early days of the in- 

 stitution, who made up the Potomac Naturalists' Club, and whose names are 

 classic in the annals of zoology in this country. Although never robust, and 

 for much of his life in delicate health, he survived all the others. Dr. Cooper 

 was assigned to the western division of the survey, terminating at Puget Sound, 

 under the superintendence of Geo. B. McClellan, of the Engineer Corps of the 

 army. Jefi'erson Davis was Secretary of War; the regimental quarter-master 

 who supplied the needs of the party on the Pacific coast was U. S. Grant. Co- 

 laborers with Cooper in working up the collections were Baird, Torrey, Asa 

 Gray, Hayden, George Gibbs, Meek, Le Conte, and Dr. Suckley, in cooper- 

 ation with whom Cooper prepared a report on the birds of Washington Terri- 

 tory, As usual in those days, he collected in all branches, and made a partic- 

 ular study of the meteorology of the region. The following year he returned 

 to Washington to prepare his report, but was soon obliged by lung trouble to 

 return to the more favorable climate of the Pacific coast. For several years 

 he devoted himself to making collections on the Pacific coast, much of the time 

 at his private cost. During the latter part of the Civil War he was surgeon 

 in the 2d Cavalry, California Volunteers, and served until the regiment was 

 mustered out. 



To he continued. 



