2. Is the sea of lava now lying on the top of the original
surface. Its depth I had no means of ascertaining.

3. Is the level of the surface first formed when the lava
was still hot.

4. Is the plain of Thingvalla, eight miles broad, its
surface shattered into a network of innumerable crevices
and fissures fifty or sixty feet deep, and each wide
enough to have swallowed the entire company of Korah. At
the foot of the plain lies a vast lake, into which,
indeed, it may be said to slope, with a gradual inclination
from the north, the imprisoned waters having burst up
through the lava strata, as it subsided beneath them.
Gazing down through their emerald depths, you can still
follow the pattern traced on the surface of the bottom,
by cracks and chasms similar to those into which the dry
portion of Thingvalla has been shivered.

The accompanying ground plan will, I trust, complete what
is wanting to fill up the picture I so long to conjure
up before the mind's eye. It is the last card I have to
play, and, if unsuccessful, I must give up the task in
despair. But to return to where I left myself, on the
edge of the cliff, gazing down with astonished eyes over
the panorama of land and water embedded at my feet. I
could scarcely speak for pleasure and surprise; Fitz was
equally taken aback, and as for Wilson, he looked as if
he thought we had arrived at the end of the world. After