Dr. Cook’s next venture was an attempt to reach the summit of Mount McKinley, in Alaska, the highest mountain in North America. His first attempt was made in 1903, and although he reached a height of only 11,400 feet, he explored a good deal of new territory. His second attempt was made in 1906, and was successful. He began the ascent with two companions, but one of them became afraid of the crevasses in the glaciers and returned to the base camp. The summit, 20,390 feet above sea-level, was reached by Dr. Cook and Edward Barrille on 16th September in a temperature of 16° F. below zero. In the following year, 1907, Dr. Cook quietly made preparations for a daring expedition to the North Pole. He was fortunate in having a wealthy friend, John R. Bradley, who paid all expenses. A strong fishing schooner was purchased and well stocked with suitable supplies. Mr. Bradley was especially interested in Arctic game, and a considerable time was spent in hunting walruses and other large animals. At Annootok, 25 miles to the north of Etah, a large settlement of natives was found, in a most prosperous condition, and here Dr. Cook decided to make his winter quarters. Rudolph Francke was chosen to be his only companion. The necessary supplies of food and fuel were landed from the schooner, and a winter house was soon erected. Steps were at once taken to secure a large supply of meat and blubber to support the Eskimo during the winter, and to make provision for the families during the absence of the men accompanying the expedition in the spring. The whole of the winter was occupied in preparing furs and equipment of all kinds. Cook had an abundance of the best hickory wood, and the sledges were made of a pattern combining the qualities of the Yukon and the Eskimo. Unlike many others, he did not abandon the old-fashioned iron shoes for strips of German silver. For dog-harness the Eskimo pattern was adopted, but in order to prevent the dogs eating the harness, the shoulder-straps were made of folds of strong canvas, while the traces were cut from cotton log-line. Pemmican, made of pounded dry beef, sprinkled with a few raisins, some currants, and a small quantity of sugar, was selected as the staple food both for men and dogs. Early in January 1908 some sledges were sent across Smith Sound to explore a route and to advance supplies. These advance expeditions were only partly successful, however, owing to storms having rendered the moonlight of little service.