Context of Contributions to the natural history of Alaska. Results of investigations made chiefly in the Yukon district and the Aleutian Islands; conducted under the auspices of the Signal service, United States Army, extending from May, 1874, to August, 1881. Prepared under the direction of Brig. and Bvt. Maj. Gen. W.B. Hazen, Chief Signal Officer of the Army, by L.M. Turner. No. II.