sufficient easting during the past two days to have brought them
to a point almost directly north of Fort Dinosaur and as nothing
could be gained by retracing their steps along the base of the
cliffs he decided to strike due south through the unexplored
country between them and the fort.

That night (September 9, 1916), they made camp a short distance
from the cliffs beside one of the numerous cool springs that are
to be found within Caspak, oftentimes close beside the still
more numerous warm and hot springs which feed the many pools.
After supper the men lay smoking and chatting among themselves.
Tippet was on guard. Fewer night prowlers threatened them, and
the men were commenting upon the fact that the farther north they
had traveled the smaller the number of all species of animals
became, though it was still present in what would have seemed
appalling plenitude in any other part of the world. The diminution
in reptilian life was the most noticeable change in the fauna of
northern Caspak. Here, however, were forms they had not met
elsewhere, several of which were of gigantic proportions.

According to their custom all, with the exception of the man on
guard, sought sleep early, nor, once disposed upon the ground for
slumber, were they long in finding it. It seemed to Bradley that
he had scarcely closed his eyes when he was brought to his feet,
wide awake, by a piercing scream which was punctuated by the
sharp report of a rifle from the direction of the fire where
Tippet stood guard. As he ran toward the man, Bradley heard
above him the same uncanny wail that had set every nerve on edge
several nights before, and the dismal flapping of huge wings.
He did not need to look up at the white-shrouded figure winging