The present range of the different forms of mountain sheep extends from Alaska and from the Pacific Ocean east to the Rocky Mountains--with a tongue extending down the Missouri River as far as the Little Missouri--south to Sonora and Lower California. The various forms from north to south appear to be Dall's sheep, the saddleback sheep, Stone's sheep, the common bighorn, with the Missouri River variety, existing to the east, in the bad lands, and with Nelson's, the Mexican and the Lower California sheep running southward into Mexico. Among the experienced hunters of both forms of Dall's sheep are Messrs. Dali DeWeese, of Colorado, and A.J. Stone, Collector of Arctic Mammals for the American Museum of Natural History. Mr. Stone gives two distinct ranges for this sheep, (1) the Alaska Mountains and Kenai Peninsula, and (2) the entire stretch of the Rocky Mountains north of latitude 60 degrees to near the Arctic coast just at the McKenzie, reaching thence west to the headwaters of the Noatak and Kowak rivers that flow into Kotzebue Sound. Stone's sheep, which was described by Dr. Allen in 1897, came from the head of the Stickine River, and two years after its description Dr. J.A. Allen quotes Mr. A.J. Stone, the collector, as saying: "I traced the _Ovis stonei_, or black sheep, throughout the mountainous country of the headwaters of the Stickine, and south to the headwaters of the Nass, but could find no reliable information of their occurrence further south in this longitude. They are found throughout the Cassiar Mountains, which extend north to 61 degrees north latitude and west to 134 degrees west longitude. How much further west they may be found I have been unable to determine. Nor could I ascertain whether their range extends from the Cassiar Mountains into the Rocky Mountains to the north of Francis and Liard River. But the best information obtained led me to believe that it does not. They are found in the Rocky Mountains to the south as far as the headwaters of the Nelson and Peace rivers in latitude 56 degrees, but I proved conclusively that in the main range of the Rocky Mountains very few of them are found north of the Liard River. Where this river sweeps south through the Rocky Mountains to Hell's Gate, a few of these animals are founds as far north as Beaver River, a tributary of the Liard. None, however, are found north of this, and I am thoroughly convinced that this is the only place where these animals may be found north of the Liard River. "I find that in the Cassiar Mountains and in the Rocky Mountains they everywhere range above timber line, as they do in the mountains of Stickine, the Cheonees, and the Etsezas. "Directly to the north of the Beaver River, and north of the Liard River below the confluence of the Beaver, we first meet with _Ovis dalli_."