Now whether, omitting accidents, the men would have made good their escape to the firmer ground of the valley, where they could have attained to a greater speed, I do not know; but suddenly one of them tripped over a loop of the weed, and the next instant lay helpless upon his face. He had been dead the following moment, but for the pluck of his companion, who faced round manfully upon the monster, and ran at it with his twenty-foot spear. It seemed to me that the spear took it about a foot below the overhanging armor of the great back shell, and I could see that it penetrated some distance into the creature, the man having, by the aid of Providence, stricken it in a vulnerable part. Upon receiving this thrust, the mighty crab ceased at once its pursuit, and clipped at the haft of the spear with its great mandible, snapping the weapon more easily than I had done the same thing to a straw. By the time we had raced up to the men, the one who had stumbled was again upon his feet, and turning to assist his comrade; but the bo'sun snatched his spear from him, and leapt forward himself; for the crab was making now at the other man. Now the bo'sun did not attempt to thrust the spear into the monster; but instead he made two swift blows at the great protruding eyes, and in a moment the creature had curled itself up, helpless, save that the huge claw waved about aimlessly. At that, the bo'sun drew us off, though the man who had attacked the crab desired to make an end of it, averring that we should get some very good eating out of it; but to this the bo'sun would not listen, telling him that it was yet capable of very deadly mischief, did any but come within reach of its prodigious mandible. And after this, he bade them look no more for shellfish; but take out the two fishing-lines which we had, and see if they could catch aught from some safe ledge on the further side of the hill upon which we had made our camp. Then he returned to his mending of the boat. It was a little before the evening came down upon the island, that the bo'sun ceased work; and, after that, he called to the men, who, having made an end of their fuel carrying, were standing near, to place the full breakers--which we had not thought needful to carry to the new camp on account of their weight--under the upturned boat, some holding up the gunnel whilst the others pushed them under. Then the bo'sun laid the unfinished batten along with them, and we lowered the boat again over all, trusting to its weight to prevent any creature from meddling with aught.