Toward the end of October, however, the temperature had fallen so low that ice had begun to form all along the coast-line of Elphinstone Land, and the weather had taken a decided change for the worse. Moreover, the party had accumulated so much extra weight in the shape of valuable skins, natural history specimens, and other curiosities, as to seriously affect the buoyancy of the _Flying Fish_ as an aerial ship; and they therefore at last--more than half-reluctantly--came to the determination to desert the enchanted region of the Pole and wend their way southward. Accordingly, on the morning of the first day of November the anchor was hove up; the vapour was turned into the air and water chambers, producing an almost perfect vacuum; and, rising into the air to an altitude of about ten thousand feet, the _Flying Fish_ turned her nose southward, and, illumined by the dazzling effulgence of the most glorious aurora the voyagers had ever seen, was sent ahead at the utmost limit of her speed. It was determined to return to England forthwith, and without pause or stoppage of any kind, unless some unforeseen necessity should arise, the object being to dispose of their various acquisitions previous to a renewal of their wanderings. The elevation at starting was therefore maintained, and the ship pursued her headlong flight to the southward with only one man--Mildmay--in the pilot-house to take charge and enact the part of look-out; the remainder busying themselves in packing up their various treasures for transference to safe-keeping on shore. The pilot-house, like every other habitable portion of the ship, was maintained at a comfortable temperature by means of pipes communicating with the vapour-generating chamber in the engine-room below; and, reclining at his ease in a most luxurious lounging chair, the lieutenant had nothing to do but maintain a vigilant lookout through the circular windows, and solace himself with his pipe meanwhile. The ship's speed through the air was about one hundred and twenty miles per hour; and by their calculations they expected to overtake the sun in about latitude 79 degrees 49 minutes north; if, therefore, the _Flying Fish_ maintained her speed, the sun ought to appear once more above the horizon in four hours thirty-five and a half minutes from the time of starting-- Lethbridge Cove being situated in exactly 89 degrees 0 minutes North latitude. It was exactly nine o'clock in the morning when they started; consequently, if their calculations were right, the sun ought to make his appearance at thirty-five and a half minutes past one; and it was this phenomenon for which Mildmay was chiefly watching, his companions being anxious to have the unique experience of seeing the luminary rise an hour and a half past mid-day. And it was for this reason, and in order that they might not on the one hand be taken by surprise by being hurried southward on the wings of a favouring gale, or on the other hand