Perceiving that the streamlet flowed from an opening of some width in the inner rock, Fritz passed through, in order to trace it to its source, presently shouting to me that the opening widened very much, and begging me to follow him.
I did so, leaving the other boys in the outer cave, and fired a pistol-shot—the reverberating echoes of which testified to the great extent of the place; and lighting the bit of candle I always carried with me, we advanced, the light burning clear and steadily, though shedding a very feeble light in so vast a space.
Suddenly Fritz exclaimed:
"I verily believe this is a second cave of salt! See how the walls glance! and how the light is reflected from the roof!"
"These cannot be salt crystals," said I; "the water which flows over them leaves no track, and tastes quite sweet. I am rather inclined to believe that we have penetrated into a cave of rock crystal!"
"Oh, how splendid! Then we have discovered a great treasure!"
"Certainly, if we could make any use of it; otherwise, in our situation, it is about as valuable as the lump of gold found by good old Robinson Crusoe."
"Anyhow, I will break off a piece for a specimen. See, here is a fine bit, only rather dull, and not transparent; what a pity! I must knock off another."
"You must go more carefully to work, or it will look as dull as the first. You destroyed its true form, which is that of a pyramid, with six sides or faces."
We remained some time in this interesting grotto, but our light burnt low after we had examined it in different directions; and Fritz having secured a large lump, which exhibited several crystals in perfection, we quitted the place, Fritz discharging a farewell shot for the sake of hearing the grand echoes.