preservation of my health, than from so frequent a renovation being absolutely necessary.  In the meanwhile I could not help making anticipations.  Fancy revelled in the wild and dreamy regions of the moon.  Imagination, feeling herself for once unshackled, roamed at will among the ever-changing wonders of a shadowy and unstable land.  Now there were boary and time-honored forests, and craggy precipices, and waterfalls tumbling with a loud noise into abysses without a bottom.  Then I came suddenly into still noonday solitudes, where no wind of heaven ever intruded, and where vast meadows of poppies, and slender, lily-looking flowers spread themselves out a weary distance, all silent and motionless forever.  Then again I journeyed far down away into another country where it was all one dim and vague lake, with a boundary line of clouds.  And out of this melancholy water arose a forest of tall eastern trees, like a wilderness of dreams.  And I have in mind that the shadows of the trees which fell upon the lake remained not on the surface where they fell, but sunk slowly and steadily down, and commingled with the waves, while from the trunks of the trees other shadows were continually coming out, and taking the place of their brothers thus entombed.  “This then,” I said thoughtfully, “is the very reason why the waters of this lake grow blacker with age, and more melancholy as the hours run on.”  But fancies such as these were not the sole possessors of my brain.  Horrors of a nature most stern and most appalling would too frequently obtrude themselves upon my mind, and shake the innermost depths of my soul with the bare supposition of their possibility.  Yet I would not suffer my thoughts for any length of time to dwell upon these latter speculations, rightly judging the real and palpable dangers of the voyage sufficient for my undivided attention.

“At five o’clock, p.m., being engaged in regenerating the atmosphere within the chamber, I took that opportunity of observing the cat and kittens through the valve.  The cat herself appeared to suffer again very much, and I had no hesitation in attributing her uneasiness chiefly to a difficulty in breathing; but my experiment with the kittens had resulted very strangely.  I had expected, of course, to see them betray a sense of pain, although in a less degree than their mother, and this would have been sufficient to confirm my opinion concerning the habitual endurance of atmospheric pressure.  But I was not prepared to find them, upon close examination, evidently enjoying a high degree of health, breathing with the greatest ease and perfect regularity, and evincing not the slightest sign of any uneasiness whatever.  I could only account for all this by extending my theory, and supposing that the highly rarefied atmosphere around might perhaps not be, as I had taken for granted, chemically insufficient for the purposes of life, and that a person born in such a medium might, possibly, be unaware of any inconvenience