"A rhamphorhynchus of the Middle Olitic, David," he said, "but,
gad, how enormous! The largest remains we ever have discovered have
never indicated a size greater than that attained by an ordinary
crow."

As we continued on through the main avenue of Phutra we saw many
thousand of the creatures coming and going upon their daily duties.
They paid but little attention to us. Phutra is laid out underground
with a regularity that indicates remarkable engineering skill. It
is hewn from solid limestone strata. The streets are broad and
of a uniform height of twenty feet. At intervals tubes pierce the
roof of this underground city, and by means of lenses and reflectors
transmit the sunlight, softened and diffused, to dispel what would
otherwise be Cimmerian darkness. In like manner air is introduced.

Perry and I were taken, with Ghak, to a large public building,
where one of the Sagoths who had formed our guard explained to a
Maharan official the circumstances surrounding our capture. The
method of communication between these two was remarkable in that
no spoken words were exchanged. They employed a species of sign
language. As I was to learn later, the Mahars have no ears, not
any spoken language. Among themselves they communicate by means
of what Perry says must be a sixth sense which is cognizant of a
fourth dimension.

I never did quite grasp him, though he endeavored to explain it
to me upon numerous occasions. I suggested telepathy, but he said
no, that it was not telepathy since they could only communicate when
in each others' presence, nor could they talk with the Sagoths or