From my earliest years I had an antipathy to rats,--so great that it mastered all the instincts of my courage. I feared them with a fear I should not have felt in presence of a wild beast, and I was confident that had I been attacked vigorously by even a single rat, the natural disgust would have rendered me unable to cope with him. When very young, I remembered hearing the story of an officer who, desirous of visiting the vaults under St. Patrick's Church, in Dublin, descended into them under the escort of the sexton. By some chance they separated from each other, and the sexton, after in vain seeking and calling for his companion for several hours, concluded that he had already returned to the upper air; and so he returned also, locking and barring the heavy door, as was his wont. The following day the officer's friends, alarmed at his absence, proceeded to make search for him through the city, and at last, learning that he had visited the cathedral, went thither, and even examined the vaults, when what was their horror to discover a portion of the brass ornament of his shako and a broken sword in the midst of several hundreds of rats, dead and dying,--the terrible remains of a combat that must have lasted for hours. This story, for the truth of which some persons yet living will vouch, I heard when a mere child; and perhaps to its influence may I date a species of terror that has always been too much for either my reason or my courage. If I slept, then, it was more owing to my utter weariness and exhaustion than to that languid frame of mind; and although too tired to dream, my first waking thought was how to commence hostilities against the rats. As to any personal hand-to-hand action, I need scarcely say I declined engaging in such; and, my supply of gunpowder being scanty, the method I hit upon was to make a species of grenade, by inserting a quantity of powder with a sufficiency of broken glass into a bottle, leaving an aperture through the cork for a fuse; then, having smeared the outside of the bottle plentifully with oil, of which I discovered a supply in bladders suspended from the ceiling, I retired to my berth, with the other extremity of the fuse in my hand, ready to ignite when the moment came.