Next day several icebergs and hummocks were noticed on the horizon. Was this a sign that land was near, or was it some ice-field that had broken up? It was difficult to know what to surmise. On arriving at the first of these hummocks, the travellers set to work to make a cave in it where they could rest more comfortably than in the tent, and after three hours' persevering toil, were able to light their stove and lie down beside it to stretch their weary limbs. CHAPTER IV. THE LAST CHARGE OF POWDER Johnson was obliged to take the dogs inside the hut, for they would have been soon frozen outside in such dry weather. Had it been snowing they would have been safe enough, for the snow served as a covering, and kept in the natural heat of the animals. The old sailor, who made a first-rate dog-driver, tried his beasts with the oily flesh of the seal; and found, to his joyful surprise, that they ate it greedily. The Doctor said he was not astonished at this, as in North America the horses were chiefly fed on fish; and he thought that what would satisfy an herbivorous horse might surely content an omnivorous dog. The whole party were soon buried in deep sleep, for they were fairly overcome with fatigue. Johnson awoke his companions early next morning, and the march was resumed in haste. Their lives depended now on their speed, for provisions would only hold out three days longer. The sky was magnificent; the atmosphere extremely clear, and the temperature very low. The sun rose in the form of a long ellipse, owing to refraction, which made his horizontal diameter appear twice the length of his vertical. [Illustration: ] The Doctor, gun in hand, wandered away from the others, braving the solitude and the cold in the hope of discovering game. He had only sufficient powder left to load three times, and he had just three balls. That was little enough should he encounter a bear, for it often takes ten or twelve shots to have any effect on these enormous animals. But the brave Doctor would have been satisfied with humbler game. A few hares or foxes would be a welcome addition to their scanty food; but all that day, if even he chanced to see one, either he was too far away, or he was deceived by refraction, and took a wrong aim. He came back to his companions at night with crestfallen looks, having wasted one ball and one charge of powder. Next day the route appeared more difficult, and the weary men could hardly drag themselves along. The dogs had devoured even the entrails of the seal, and began to gnaw their traces. A few foxes passed in the distance, and the Doctor lost another ball in attempting to shoot them. They were forced to come to a halt early in the evening, though the road was illumined by a splendid Aurora Borealis; for they could not put one foot before the other. Their last meal, on the Sunday evening, was a very sad one--if no providential help came, their doom was sealed.