"But luck was against him, for he could not get near the captain the whole of that day, and there were keen eyes always fastened upon him by the convicts, who were on deck by fifty at a time, and watched each other closely for fear of treachery. Amongst each fifty there were always some who were in the plot, and if they had suspected Birt of betraying them they would have made short work of him, and this he knew very well. Evening came, and still he had been able to do nothing. The next morning at four o'clock the bloody deed was to be done. He paced the deck to and fro, to and fro, almost in despair, and yet determined to venture something for the captain's sake. Then he noticed that the first-mate was in the hold, serving out water, and suddenly an idea came into Birt's head. He pretended to stumble, threw himself right down the hatchway as though by accident, and fell a distance of sixteen feet into the hold. As you may imagine all was immediately stir and excitement, for at first they thought he was killed--and, indeed, he was badly bruised, having fallen on to a water-cask. In the bustle, however, he managed to slip the book into the mate's hand, and the thing was done. The surgeon was sent for and they got him up on deck, where, while his hurts were being looked to, he had the satisfaction of seeing the mate go aft and then into the captain's cabin. "Promptly the soldiers were ordered up, but when the convicts on deck found their plot discovered they did not yield without a struggle. It was a short but a violent one, for in the confusion they got hold of some fire arms and fought desperately. The captain was twice wounded, and it was then that the old watch you see there had its share in saving his life. For the bullet, striking against the case and passing through it, was thus lessened in force, and did not reach a vital part of the body. It was, nevertheless, a serious hurt, and caused him much suffering, for it was some days before the bit of metal could be extracted from the wound. "Meanwhile the convicts, being overpowered, were secured under hatches again, and the captain then made Birt point out the ringleaders and the most desperate of the men, which he did to the number of thirteen. These were placed in irons for the rest of the voyage, and when the vessel arrived at Port Jackson it was supposed they would have been hanged. But the governor declaring that it was not in his power to do so, they were registered to be kept in irons, chained two and two together, all their lives long. "And thus this wicked plot was found out, and those wicked men punished, and thus it pleased Heaven to preserve your great-grandfather's life-- first by reason of the gratitude and devotion of Mr Birt, and secondly through his stout old watch which did him good service and turned aside the enemy's bullet." Aunt Hannah paused, and looked up at the picture again. "But," said Susan, "what became of Mr Birt?"