You all saw a number of large, heavy boxes lowered into the hold before we sailed. I know you did, because you asked me what they containted and commented upon the large letter 'H' which was painted upon each box. These boxes contain the various parts of a hydro-aeroplane. I purpose assembling this upon the strips of beach described in Bowen's manuscript—the beach where he found the dead body of the apelike man—provided there is sufficient space above high water; otherwise we shall have to assemble it on deck and lower it over the side. After it is assembled, I shall carry tackle and ropes to the cliff-top, and then it will be comparatively simple to hoist the search-party and its supplies in safety. Or I can make a sufficient number of trips to land the entire party in the valley beyond the barrier; all will depend, of course, upon what my first reconnaissance reveals."
That afternoon we steamed slowly along the face of Caprona's towering barrier.
"You see now," remarked Billings as we craned our necks to scan the summit thousands of feet above us, "how futile it would have been to waste our time in working out details of a plan to surmount those." And he jerked his thumb toward the cliffs. "It would take weeks, possibly months, to construct a ladder to the top. I had no conception of their formidable height. Our mortar would not carry a line halfway to the crest of the lowest point. There is no use discussing any plan other than the hydro-aeroplane. We'll find the beach and get busy."
Late the following morning the lookout announced that he could discern surf about a mile ahead; and as we approached, we all saw the line of breakers broken by a long sweep of rolling surf upon a narrow beach. The launch was lowered, and five of us made a landing, getting a good ducking in the ice-cold waters in the doing of it; but we were rewarded by the finding of the clean-picked bones of what might have been the skeleton of a high order of ape or a very low order of man, lying close to the base of the cliff. Billings was satisfied, as were the rest of us, that this was the beach mentioned by Bowen, and we further found that there was ample room to assemble the seaplane.
A Disappearance
BILLINGS, having arrived at a decision, lost no time in acting, with the result that before mid-afternoon we had landed all the large boxes marked "H" upon the beach, and were busily engaged in opening them. Two days later the plane was assembled and tuned. We loaded tackles and ropes, water, food and ammunition in it, and then we each implored Billings to let us be the one to accompany him. But he would take no one. That was Billings; if there was any especially difficult or dangerous work to be done, that one man could do, Billings always did it himself. If he needed assistance, he never called for volunteers—just selected the man or men he considered best qualified for the duty. He said that he considered the principles underlying all volunteer service fundamentally wrong, and that it seemed to him that calling for volunteers reflected upon the courage and loyalty of the entire command.
We rolld the plane down to the water's edge, and Billings moutned the pilot's seat. There was a moment's delay as he assured himself that he had everything necessary. Jimmy Hollis went over his armament and ammunition to see that nothing had been omitted. Besides pistol and rifle, there was the machine-gun mounted in front of him on the plane, and ammunition for all three. Bowen's account of the terrors of Caspak had impressed us all with the necessity for proper means of defense.
At last all was ready. The motor was started, and we pushed the plane out into the surf. A moment later, and she was skimming seaward. Gently she rose from the surface of the water, executed a wide spiral as she mounted rapidly, circled once far above us and then disappeared over the crest of the cliffs. We all stood silent and expectant, our eyes glued upon the towering summit above us. Hollis, who was now in command, consulted his wristwatch at frequent intervals.
"Gad," exclaimed Short, "we ought to be hearing from him pretty soon!"
Hollis laughed nervously. "He's been gone only ten minutes," he announced.
"Seems like an hour," snapped Short. "What's that? Did you hear that? He's firing! It's the machine-gun! Oh, Lord; and here we are as helpless as a lot of old ladies ten thousand miles away! We can't do a thing. We don't know what's happening. Why didn't he let one of us go with him?"
Yes, it was the machine-gun. We could hear it distinctly for at least a minute. Then came silence. That was two weeks ago. We have had no sign or signal from Tom Billings since.
CHAPTER II
I'LL never forget my first impressions of Caspak as I circled in, high over the surrounding cliffs. From the plane I looked down through a mist upon the blurred landscape beneath me. The hot, humid atmosphere of Caspak condenses as it is fanned by the cold Antarctic air-currents which sweep across the crater's top, sending a tenuous ribbon of vapor far out across the Pacific. Through this the picture gave one the suggestion of a colossal impressionistic canvas in greens and browns and scarlets and yellows surrounding the deep blue of the inland sea—just blobs of color taking form through the tumbling mist.
I dived close to the cliffs and skirted them for several miles without finding the least indication of a suitable landing-place; and then I swung back at a lower level, looking for a clearing close to the bottom of the mighty escarpment; but I could find none of sufficient area to insure safety. I was flying pretty low by this time, not only looking for landing places but watching the myriad life beneath me. I was down pretty well toward the south end of the island, where an arm of the lake reaches far inland, and I could see the surface of the water literally black with creatures of some sort. I was too far up to recognize individuals, but the general impression was of a vast army of amphibious monsters. The land was almost equally alive with crawling, leaping, running, flying things. It was one of the latter which nearly did for me while my attention was fixed upon the weird scene below.
The first intimation I had of it was the sudden blotting out of the sun from above, and as I glanced quickly up, I saw a most terrific creature
