osition of the fireplace and
bring it nearer the rocks, where he thought it would burn better. It did
burn better--so well, indeed, that some of the dry leaves of the vines
that there covered the face of the rocks took fire. Ralph watched with
interest the dry leaves blaze and the green ones splutter, and then he
thought it would be a pity to scorch those vines, which were among the
few green things about them, and he tried to put out the fire. But this
he could not do, and, when he called Maka, the negro was not able to
help him. The fire had worked its way back of the green vines, and seemed
to have found good fuel, for it was soon crackling away at a great rate,
attracting the rest of the party.

"Can't we put it out?" cried Miss Markham. "It is a pity to ruin those
beautiful vines."

The captain smiled and shook his head. "We cannot waste our valuable
water on that conflagration," said he. "There is probably a great mass
of dead vines behind the green outside. How it crackles and roars! That
dead stuff must be several feet thick. All we can do is to let it burn.
It cannot hurt us. It cannot reach your tent, for there are no vines
over there."

The fire continued to roar and blaze, and to leap up the face of the
rock.

"It is wonderful," said Mrs. Cliff, "to think how those vines must have
been growing and dying, and new ones growing and dying, year after year,
nobody knows how many ages."

"What is most wonderful to me," said the captain, "is that the vines ever
grew there at all, or that these bushes should be here. Nothing can grow
in this region, unless it is watered by a stream from the mountains, and
there is no stream here."

Miss Markham was about to offer a supposition to the effect that perhaps
the precipitous wall of rock which surrounded the little plateau, and
shielded it from the eastern sun, might have had a good effect upon the
vegetation, when suddenly Ralph, who had a ship's biscuit on the end of a
sharp stick, and was toasting it in the embers of a portion of the burnt
vines, sprang back with a shout.

"Look out!" he cried. "The whole thing's coming down!" And, sure enough,
in a moment a large portion of the vines, which had been clinging to the
rock, fell upon the ground in a burning mass. A cloud of smoke and dust
arose, and when it had cleared away the captain and his party saw upon
the perpendicular side of the rock, which was now revealed to them as if
a veil had been torn away from i