in spite of myself, "leaving absolutely no trace."
NO trace! Something attracted my eyes. The chief had opened his hand. The diamond there flashed and sparkled as if mocking me. I pulled myself together, and went on.
"It all comes back to me now. One day I came out here and found the professor terribly distraught. He told me that, with the aid of electric currents he had been able to invent the absolute zero, but he could not invent a container."
"Why?" Those eyes continued to bore into mine.
"Because—remember it is years since he told me this—there was difficulty in controlling the power. Besides destroying living things, it would destroy bricks and mortar, stone and iron. Only one substance it could not wipe out—crystalline of diamond hardness.
"I know, now!" I jumped to my feet and grabbed the chief's arm. "I know now what he meant. Fool, fool! Why did I not think of it before? This—" I swung towards the cage—"is compensation." Almost panting in my eagerness I went on:
"My friend told me that the law of compensation would atone to him for the tragedy of his youth. Absolute zero in suffering would be atoned for by a real state of absolute zero. Chief!" I whirled on him. "Don't you understand? This is the perfected dream of my friend. It is the absolute zero."
"Humph! Plausible but not convincing." I slumped back at the officer's words. "That does not explain the professor's disappearance. Even if it did, what about Mr. Lathom? And don't forget this contrivance is worked from outside. We found the diamond inside. Of course, he might have placed it there himself to test the machine," he concluded.
"Of course, that's it," I commenced. But I regretted the words when I saw suspicion flicker again in the chief's eyes. Lamely I finished, "And he has probably rushed off, in an ecstasy of triumph, to acquaint professional colleagues."
"Without unlocking any doors or taking a car, eh?
"Mr. Thornton." The chief stood up and regarded me sternly. "As a sensible man, don't you think yourself that your story is a bit thin? The professor has disappeared. Here is a strange-looking case which you say is an absolute zero container. Whether you know, or are just jumping at conclusions, remains to be proved. But even if it is, do you think that, after perfecting such a tremendous invention, the professor would commit suicide?"
"On the contrary," I gasped, "my friend was a man of gentle, kindly disposition, but strong purpose. I should think his first action on attaining his life's ambition would be to notify me, his closest friend."
"And he didn't." Every word condemned me, and roused me to retaliate.
"Chief, I know enough of the law to know that, before you can try a man for murder, you must prove that murder has been committed." I grinned savagely. "You must have the corpus delicti. Go ahead! Find my friend or his remains, or else withdraw your charges." I grinned again, with shocked mirthlessness.
THEN I buried my head in my hands. I had called in the police to help find the professor, and they had only blundered around and asked a lot of stupid questions. The chief had practically accused me of murder—something I knew he could not prove, yet feared he might. Because I had told the chief of the locked doors and unused cars, he had confined his investigations to the house itself.
He interrupted my thoughts.
"Mr. Thornton, I am going back to town. You will remain here with my men. I advise you to get some sleep, as I shall not be able to carry out certain investigations until the morning.
