I had little object -- certainly no hope -- in these researches

I had little object -- certainly no hope -- in these researches, but a vague curiosity prompted me to continue them. Quitting the wall, I resolved to cross the area of the enclosure. At first I proceeded with extreme caution, for the floor although seemingly of solid material was treacherous with slime. At length, however, I took courage and did not hesitate to step firmly -- endeavouring to cross in as direct a line as possible. I had advanced some ten or twelve paces in this manner, when the remnant of the torn hem of my robe became entangled between my legs. I stepped on it, and fell violently on my face.
In the confusion attending my fall, I did not immediately apprehend a somewhat startling circumstance, which yet, in a few seconds afterward, and while I still lay prostrate, arrested my attention. It was this: my chin rested upon the floor of the prison, but my lips, and the upper portion of my head, although seemingly at a less elevation than the chin, touched nothing. At the same time, my forehead seemed bathed in a clammy vapour, and the peculiar smell of decayed fungus arose to my nostrils. I put forward my arm, and shuddered to find that I had fallen at the very brink of a circular pit, whose extent of course I had no means of ascertaining at the moment. Groping about the masonry just below the margin, I succeeded in dislodging a small fragment, and let it fall into the abyss. For many seconds I hearkened to its reverberations as it dashed against the sides of the chasm in its descent; at length there was a sullen plunge into water, succeeded by loud echoes. At the same moment there came a sound resembling the quick opening, and as rapid closing of a door overhead, while a faint gleam of light flashed suddenly through the gloom, and as suddenly faded away.
I saw clearly the doom which had been prepared for me, and congratulated myself upon the timely accident by which I had escaped. Another step before my fall, and the world had seen me no more and the death just avoided was of that very character which I had regarded as fabulous and frivolous in the tales respecting the Inquisition. To the victims of its tyranny, there was the choice of death with its direst physical agonies, or death with its most hideous moral horrors. I had been reserved for the latter. By long suffering my nerves had been unstrung, until I trembled at the sound of my own voice, and had become in every respect a fitting subject for the species of torture which awaited me.
Shaking in every limb, I groped my way back to the wall -- resolving there to perish rather than risk the terrors of the wells, of which my imagination now pictured many in various positions about the dungeon. In other conditions of mind I might have had courage to end my misery at once by a plunge into one of these abysses; but now I was the veriest of cowards. Neither could I forget what I had read of these pits -- that the SUDDEN extinction of life formed no part of their most horrible plan.
Agitation of spirit kept me awake for many long hours; but at length I again slumbered. Upon arousing, I found by my side, as before, a loaf and a pitcher of water. A burning thirst consumed me, and I emptied the vessel at a draught. It must have been drugged, for scarcely had I drunk before I became irresistibly drowsy. A deep sleep fell upon me -- a sleep like that of death. How long it lasted of course I know not; but when once again I unclosed my eyes the objects around me were visible. By a wild sulphurous lustre, the origin of which I could not at first determine, I was enabled to see the extent and aspect of the prison.