was taking place, had stopped precisely at twenty-nine inches. "You perceive," said the Professor, "we have as yet only to endure the pressure of air. I am curious to replace the barometer by the manometer." The barometer, in fact, would become useless as soon as the weight of the air was greater than that calculated as about the level of the ocean.
"But," said I, "is it not very much to be feared that this ever-increasing pressure may not in the end turn out very painful and inconvenient?"
"No," said he. "We shall descend very slowly, and our lungs will be gradually accustomed to breathe compressed air. It is well known that aëronauts have gone so high as to be nearly without air at all—why, then, should we not accustom ourselves to breathe when we have, say a little too much of it? For myself, I am certain I shall prefer it. Let us not lose a moment. Where is the packet which preceded us in our descent?"
I smilingly pointed it out to my uncle. Hans had not seen it, and believed it caught somewhere above us; "huppe" as he phrased it.
"Now," said my uncle, "let us breakfast, and break fast like people who have a long day's work before them."
Biscuit and dried meat, washed down by some mouthfuls of water flavored with schiedam, was the material of our luxurious meal. As soon as it was finished, my uncle took from his pocket a note-book destined to be filled by memoranda of our travels. He had already placed his instruments in order, and this is what he wrote:—Monday, July 1st. Chronometer, 8h. 17m. morning. Barometer, 29 inches. Thermometer, 43 degrees Fahr. Direction, E. S. E.
This last observation referred to the obscure gallery, and was indicated to us by the compass.
"Now, Harry," cried the Professor, in an enthusiastic tone of voice, "we are truly about to take our first step into the Interior of the Earth; once before visited by man since the first creation of the world. You may consider, therefore, that at this precise moment our travels really commence."
As my uncle made this remark, he took in one hand the Ruhmkorf coil apparatus, which hung around his neck, and with the other he put the electric current in communication with the filament of the lantern. And a bright light at once illumined that dark and gloomy tunnel! The effect was magical!
Hans, who carried the second apparatus, had it put into operation too. This ingenious application of electricity to practical purposes enabled us to move along by the light of an artificial day, amid even the flow of the most inflammable and combustible gases.
"Forward!" cried my uncle. Each took up his burden. Hans going first, my uncle following, I going third, we entered the somber gallery! Just as we were about to engulf ourselves in this dismal passage, I lifted up my head, and through the tube-like shaft I saw that Iceland sky I was never to see again! Was it the last I should ever see of any sky?
The stream of lava flowing from the bowels of the earth in 1229, had forced itself a passage through the tunnel. It lined the whole inside with its thick and brilliant coating. The electric light added very greatly to the brilliancy of the effect. The great difficulty of our journey now began. How were we to prevent ourselves from slipping down the steeply-inclined plane? Happily some cracks, abrasures of the soil, and other irregularities, served the place of steps; and we descended slowly, allowing our heavy luggage to slip on before us, at the end of a long cord.
But that which served as steps under our feet, became in other places stalactites. The lava, very porous in certain places, took the form of little round blisters. Crystals of opaque quartz, adorned with limpid drops of natural glass suspended to the roof like lusters, seemed to take fire as we passed beneath them. One would have fancied that the genii of romance were illuminating their underground palaces to receive the sons of men.
"Magnificent! Glorious!" I cried in a moment of involuntary enthusiasm, "what a spectacle, uncle! Do you not admire these variegated shades of lava, which run through a whole series of colors, from reddish brown to pale yellow—by the most insensible degrees? And these crystals, they appear like luminous globes."
"You are beginning to see the charms of travel, Master Harry," cried my uncle. "Wait a bit, until we advance farther. What we have as yet discovered is nothing—onwards, my boy, onwards!"
It would have been a far more correct and appropriate expression, had he said, "let us slide," for we were going down an inclined plane with perfect ease. The compass indicated that we were moving in a south-easterly direction. The flow of lava had never turned to the right or the left. It had the inflexibility of a straight line.
Nevertheless, to my surprise, we found no perceptible increase in heat. This proved the theories of Humphrey Davy to be founded on truth, and more than once I found myself examining the thermometer in silent astonishment. Two hours after my departure it only marked 54 degrees Fahrenheit. I had every reason to believe from this that our descent was far more horizontal than vertical. As for discovering the exact depth to which we had attained, nothing could be easier. The Professor, as he advanced, measured the angles of deviation and inclination; but he kept the result of his observations to himself.
About eight o'clock in the evening, my uncle gave the signal for the night's rest, Hans seated himself on the ground. The lamps were hung to fissures in the lava rock. We were now in a large cavern where air was not wanting. On the contrary it abounded. What could be the cause of this—to what atmospheric agitation could be ascribed this draught? But this was a question which I did not care to discuss just then. Fatigue and hunger made me incapable of reasoning. An almost unceasing march of twelve hours had been kept up not without great exhaustion. I was really and truly worn out; and delighted enough I was to hear the word "Halt."
Hans laid out some provisions on a lump of lava, and we each supped with keen relish. One thing, however, caused us great uneasiness—our water reserve was already half exhausted. My uncle had full confidence in finding subterranean resources, but hitherto we had completely failed in doing so. I could not help calling my uncle's attention to the circumstance. "And are you surprised at this total absence of springs?" he said.
(Continued on page 135)
