"So you admit that the a.s.sertion governing the surfaces of liquids is true only when the liquids are connected from beneath. In other words, your thought is one-sided, as science thought often is."

"Yes."

[Ill.u.s.tration: FIG. 18. E, water surface. F, brine surface.]

"Now as to the beds of salt deep within the earth. You are also mistaken concerning their origin. The water of the ocean that runs through an open channel from the one side may flow into an underground lake, that by means of the contact action (suction) of the overlying and surrounding strata is being continually emptied of its water, but not its salt. Thus by absorption of water the brine of the lake becomes in time saturated, starting crystallization regularly over the floor and sides of the basin. Eventually the entire cavity is filled with salt, and a solid ma.s.s of rock salt remains. If, however, before the lake becomes solid, the brine supply is shut off by some natural cause as by salt crystals closing the pa.s.sage thereto, the underground lake is at last drained of its water, the salt crystallizing over the bottom, and upon the cliffs, leaving great crevices through the saline deposits, as chances to have been the case with the salt formations through which I pa.s.sed with my guide, and have recently described to you."

"Even now I have my doubts as to the correctness of your explanations, especially concerning the liquid surfaces."

"They are facts, however; liquids capable of being mixed, if connected by porous arches (bibulous paper is convenient for ill.u.s.trating by experiment) reverse the rule men have accepted to explain the phenomena of liquid equilibrium, for I repeat, the lighter one rushes into that which is heavier, and the surface of the heavier liquid rises. You can try the experiment with alcohol and water, taking precautions to prevent evaporation, or you can vary the experiment with solutions of various salts of different densities; the greater the difference in gravity between the two liquids, the more rapid will be the flow of the lighter one into the heavier, and after equilibrium, the greater will be the contrast in the final height of the resultant liquid surfaces."

"Men will yet explain this effect by natural laws," I said.

"Yes," he answered; "when they learn the facts; and they will then be able to solve certain phenomena connected with diffusion processes that they can not now understand. Did I not tell you that after the fact had been made plain it was easy to see how Columbus stood the egg on its end? What I have demonstrated by experiment is perhaps no new principle in hydrostatics. But I have applied it in a natural manner to the explanation of obscure natural phenomena, that men now seek unreasonable methods to explain."

"You may proceed with your narrative. I accept that when certain liquids are connected, as you have shown, by means of porous substances, one will pa.s.s into the other, and the surface of the lighter liquid in this case will a.s.sume a position below that of the heavier."

"You must also accept," said he, "that when solutions of salt are subjected to earth attraction, under proper conditions, the solids may by capillary attraction be left behind, and pure water finally pa.s.s through the porous medium. Were it not for this law, the only natural surface spring water on earth would be brine, for the superficial crust of the earth is filled with saline solutions. All the spring-fed rivers and lakes would also be salty and fetid with sulphur compounds, for at great depths brine and foul water are always present. Even in countries where all the water below the immediate surface of the earth is briny, the running springs, if of capillary origin, are pure and fresh. You may imagine how different this would be were it not for the law I have cited, for the whole earth's crust is permeated by brine and saline waters. Did your 'philosophy' never lead you to think of this?"

Continuing, my guest argued as follows: "Do not lakes exist on the earth's surface into which rivers and streams flow, but which have no visible outlet? Are not such lakes saline, even though the source of supply is comparatively fresh? Has it never occurred to you to question whether capillarity a.s.sisted by surface evaporation (not evaporation only as men a.s.sert) is not separating the water of these lakes from the saline substances carried into them by the streams, thus producing brine lakes? Will not this action after a great length of time result in crystalline deposits over portions of the bottoms of such lakes, and ultimately produce a salt bed?"

"It is possible," I replied.

"Not only possible, but probable. Not only probable, but true. Across the intervening brine strata above the salt crystals the surface rivers may flow, indeed, owing to differences in specific gravity the surface of the lake may be comparatively fresh, while in the quiet depths below, beds of salt crystals are forming, and between these extremes may rest strata after strata of saline solutions, decreasing in gravity towards the top."

Then he took his ma.n.u.script, and continued to read in a clear, musical voice, while I sat a more contented listener than I had been previously.

I was not only confuted, but convinced. And I recalled the saying of Socrates, that no better fortune can happen a man than to be confuted in an error.

MY UNBIDDEN GUEST CONTINUES READING HIS Ma.n.u.sCRIPT.

CHAPTER XXI.

MY WEIGHT DISAPPEARING.

We halted suddenly, for we came unexpectedly to the edge of a precipice, twenty feet at least in depth.

"Let us jump down," said my guide.

"That would be dangerous," I answered; "can not we descend at some point where it is not so deep?"

"No; the chasm stretches for miles across our path, and at this point we will meet with the least difficulty; besides, there is no danger. The specific gravity of our bodies is now so little that we could jump twice that distance with impunity."

"I can not comprehend you; we are in the flesh, our bodies are possessed of weight, the concussion will be violent."

"You reason again from the condition of your former life, and, as usual, are mistaken; there will be little shock, for, as I have said, our bodies are comparatively light now. Have you forgotten that your motion is continuously accelerated, and that without perceptible exertion you move rapidly? This is partly because of the loss of weight. Your weight would now be only about fifty pounds if tested by a spring balance."

I stood incredulous.

"You trifle with me; I weigh over one hundred and fifty pounds; how have I lost weight? It is true that I have noticed the ease with which we have recently progressed on our journey, especially the latter part of it, but I attribute this, in part, to the fact that our course is down an incline, and also to the vitalizing power of this cavern air."

"This explains part of the matter," he said; "it answered at the time, and I stated a fact; but were it not that you are really consuming a comparatively small amount of energy, you would long before this have been completely exhausted. You have been gaining strength for some hours; have really been growing younger. Your wrinkled face has become more smooth, and your voice is again natural. You were prematurely aged by your brothers on the surface of the earth, in order that when you pa.s.s the line of gravity, you might be vigorous and enjoying manhood again. Had this aging process not been accomplished you would now have become as a child in many respects."

[Ill.u.s.tration: "I BOUNDED UPWARD FULLY SIX FEET."]

He halted before me. "Jump up," he said. I promptly obeyed the unexpected command, and sprung upward with sufficient force to carry me, as I supposed, six inches from the earth; however I bounded upward fully six feet. My look of surprise as I gently alighted, for there was no concussion on my return, seemed lost on my guide, and he quietly said:

"If you can leap six feet upward without excessive exertion, or return shock, can not you jump twenty feet down? Look!"

[Ill.u.s.tration: "I FLUTTERED TO THE EARTH AS A LEAF WOULD FALL."]

And he leaped lightly over the precipice and stood unharmed on the stony floor below.

Even then I hesitated, observing which, he cried:

"Hang by your hands from the edge then, and drop."

I did so, and the fourteen feet of fall seemed to affect me as though I had become as light as cork. I fluttered to the earth as a leaf would fall, and leaned against the precipice in surprised meditation.

"Others have been through your experience," he remarked, "and I therefore can overlook your incredulity; but experiences such as you now meet, remove distrust. Doing is believing." He smiled benignantly.

[Ill.u.s.tration: "WE LEAPED OVER GREAT INEQUALITIES."]

I pondered, revolving in my mind the fact that persons had in mental abstraction, pa.s.sed through unusual experiences in ignorance of conditions about them, until their attention had been called to the seen and yet unnoticed surroundings, and they had then beheld the facts plainly. The puzzle picture (see p. 129) stares the eye and impresses the retina, but is devoid of character until the hidden form is developed in the mind, and then that form is always prominent to the eye. My remarkably light step, now that my attention had been directed thereto, was constantly in my mind, and I found myself suddenly possessed of the strength of a man, but with the weight of an infant. I raised my feet without an effort; they seemed dest.i.tute of weight; I leaped about, tumbled, and rolled over and over on the smooth stone floor without injury. It appeared that I had become the airy similitude of my former self, my material substance having wasted away without a corresponding impairment of strength.I pinched my flesh to be a.s.sured that all was not a dream, and then endeavored to convince myself that I was the victim of delirium; but in vain. Too sternly my self-existence confronted me as a reality, a cruel reality. A species of intoxication possessed me once more, and I now hoped for the end, whatever it might be. We resumed our journey, and rushed on with increasing rapidity, galloping hand in hand, down, down, ever downward into the illuminated crevice of the earth. The spectral light by which we were aureoled increased in intensity, as by arithmetical progression, and I could now distinguish objects at a considerable distance before us. My spirits rose as if I were under the influence of a potent stimulant; a liveliness that was the opposite of my recent despondency had gained control, and I was again possessed of a delicious mental sensation, to which I can only refer as a most rapturous exhilaration. My guide grasped my hand firmly, and his touch, instead of revolting me as formerly it had done, gave pleasure. We together leaped over great inequalities in the floor, performing these aerial feats almost as easily as a bird flies. Indeed, I felt that I possessed the power of flight, for we bounded fearlessly down great declivities and over abysses that were often perpendicular, and many times our height. A very slight muscular exertion was sufficient to carry us rods of distance, and almost tiptoeing we skimmed with ever-increasing speed down the steeps of that unknown declivity. At length my guide held back; we gradually lessened our velocity, and, after a time, rested beside a horizontal substance that lay before us, apparently a sheet of gla.s.s, rigid, immovable, immeasurably great, that stretched as a level surface before us, vividly distinct in the brightness of an earth light, that now proved to be superior to sunshine. Far as the eye could reach, the gla.s.sy barrier to our further progress spread as a crystal mirror in front, and vanishing in the distance, shut off the beyond.

[Ill.u.s.tration: "FAR AS THE EYE COULD REACH THE GLa.s.sY BARRIER SPREAD AS A CRYSTAL MIRROR."]

INTERLUDE.--THE STORY AGAIN INTERRUPTED.

CHAPTER XXII.

MY UNBIDDEN GUEST DEPARTS.

Once more I must presume to interrupt this narrative, and call back the reader's thoughts from those mysterious caverns through which we have been tracing the rapid footsteps of the man who was abducted, and his uncouth pilot of the lower realms. Let us now see and hear what took place in my room, in Cincinnati, just after my visitor, known to us as The-Man-Who-Did-It, had finished reading to me, Lewellyn Drury, the custodian of this ma.n.u.script, the curious chapter relating how the underground explorers lost weight as they descended in the hollows of the earth. My French clock struck twelve of its clear silvery notes before the gray-bearded reader finished his stint for the occasion, and folded his ma.n.u.script preparatory to placing it within his bosom.