On his return, Mr. Hall, nothing daunted by hardships and failures, commenced writing and lecturing on the theory of an open Polar Sea. As he had done before, so now he succeeded in impressing not only the popular mind but scientific men and statesmen with the plausibility of his theory and the practicability of his plans. Another North Pole expedition was proposed; Congress appropriated to it fifty thousand dollars, and Mr. Hall was appointed its commander. A craft of about four hundred tons, being larger than either of its predecessors on the same errand, was selected, and named the "Polaris." She was a screw-propeller, and rigged as a fore-topsail schooner. Her sides were covered with a six-inch white oak planking, nearly doubling their strength. Her bows were nearly solid white oak, made sharp, and sheathed with iron. One of her boilers was fitted for the use of whale or seal oil, by which steam could be raised if the coal was exhausted. She was supplied with five extraordinary boats. One of these must have been the last Yankee invention in the boat line. It is represented as having a capacity to carry twenty-five men, yet weighing only two hundred and fifty pounds; when not in use it could be folded up and packed snugly away. The "Polaris" was, of course, amply equipped and ably manned, and great and useful results were expected from her. President Grant is said to have entered with interest into this enterprise of Captain Hall, and the nation said, "God bless him and his perilous undertaking!" though many doubted the wisdom of any more Arctic expeditions. A few days before his departure Mr. Hall received from the hand of his friend, Henry Grinnell, a flag of historic note. It had fluttered in the wind near the South Pole with Lieutenant Wilkes, in 1838; had been borne by De Haven far northward; it had gone beyond De Haven's highest in the Kane voyage, and was planted still farther North Poleward by Hayes. "I believe," exclaimed Captain Hall, on receiving it, "that this flag, in the spring of 1872, will float over a new world, in which the North Pole star is its crowning jewel." The "Polaris" left New York June 29, 1871, tarried for a few days at New London, and was last heard from as she was ready to steam northward, the last of August, from Tussuissak, the most northern of the Greenland outposts. At this place Captain Hall met our old acquaintance, Jensen, of the Hayes expedition. He was flourishing as "governor" of a few humble huts occupied by a few humbler people, and he put on consequential airs in the presence of his white brother. He would not be a dog-driver again to an Arctic exploration--not he! Hall says he had "a face of brass in charging for his dogs." But the full complement of sixty was made up here, and his stock of furs was increased.