"Passing my hand over him, I found he was holding himself in his present position by means of his forelegs, which were stretched out upon the floor. What a dog this must be, who could climb a wall! But I gave no time to conjectures of this sort. How could I avail myself of his assistance? In what manner could he enable me to escape from that dangerous tower?
"Suddenly a thought came to me. I remembered the snake part of him. Judging from the ratio of diminution, which I have mentioned before, that part, if hanging down, must reach nearly, if not quite, to the ground. By taking advantage of this means of descent I might be saved, but the feat would require dexterity and an immense amount of faith. This serpent-like portion of the animal was invisible. How could I know how long it was!
"But there was no time for consideration; the wind had again arisen, and was blowing with fury. The tower shook beneath me; at any moment it might fall. If I should again escape from death, through the assistance of my invisible friend, I must avail myself of that assistance instantly.
"I stopped and felt the animal. He still hung by part of his body and by his forelegs to the floor of the dungeon, and by reaching out I could feel that the rest of him extended downward. I therefore seized his body in my arms, threw myself out of the aperture, and began to slide down.
"In a very short time I found that I had reached the snake portion of the creature, and, throwing my arms and legs around it, I endeavoured with all my strength to prevent a too rapid descent; but in spite of all my efforts, my downward progress was faster than I would have wished it to be. But there was no stopping; I must slip down.
"In these moments of rapid descent my mind was filled with wild anxiety concerning the serpent-like form to which I was clinging. I remembered in a flash that there were snakes whose caudal extremity dwindled away suddenly into a point. This one might do so, and at any instant I might come to the end of the tail and drop upon the jagged stones below.
"Calculation after calculation of the ratio of diminution flashed through my mind during that awful descent. My whole soul was centred upon one point. When would this support end? When would I drop?
"Fortunately I was on the leeward side of the tower, and I was not swung about by the wind. Steadily I descended, and steadily the diameter of the form I grasped diminished; soon I could grasp it in my hand; then with a terrified glance I looked below. I was still at a sickening distance from the ground. I shut my eyes. I slipped down, down, down. The tail became like a thick rope which I encircled with each hand. It became thinner and thinner. It grew so small that I could not hold it; but as I felt it slip from my fingers my feet rested on a pile of stones.
"Bewildered and almost exhausted, I stumbled over the ruins, gained the unencumbered ground, and ran as far from the tower as I could, sinking down at last against the trunk of a tree in a neighbouring field. Scarcely had I reached this spot when the fury of the wind-storm appeared to redouble, and before the wild and shrieking blast the tower bent and then fell with a crash upon the other ruins.
"The first thought that came into my mind when I beheld the dreadful spectacle concerned the creature who had twice saved my life. Had he escaped, or was he crushed beneath that mass of stone? I felt on either side to discover if he were near me, but he was not. Had he given his life for mine?