“What you have given you may take away,” said von Horn, in a low tone. Professor Maxon shuddered. Those three horrid days in the workshop at Ithaca flooded his memory with all the gruesome details he had tried for so many months to forget. The haunting ghosts of the mental anguish that had left him an altered man—so altered that there were times when he had feared for his sanity! “No, no!” he almost shouted. “It would be murder. They are—” “They are _things_,” interrupted von Horn. “They are not human—they are not even beast. They are terrible, soulless creatures. You have no right to permit them to live longer than to substantiate your theory. None but us knows of their existence—no other need know of their passing. It must be done. They are a constant and growing menace to us all, but most of all to your daughter.” A cunning look came into the professor’s eyes. “I understand,” he said. “The precedent once established, all must perish by its edict—even those which may not be grotesque or bestial—even this perfect one,” and he touched again the vat, “and thus you would rid yourself of rival suitors. But no!” he went on in a high, trembling voice. “I shall not be led to thus compromise myself, and be thwarted in my cherished plan. Be this one what he may he shall wed my daughter!” The man had raised himself upon his toes as he reached his climax—his clenched hand was high above his head—his voice fairly thundered out the final sentence, and with the last word he brought his fist down upon the vat before him. In his eyes blazed the light of unchained madness. Von Horn was a brave man, but he shuddered at the maniacal ferocity of the older man, and shrank back. The futility of argument was apparent, and he turned and left the workshop. Sing Lee was late that night. In fact he did not return from his fruitless quest for gulls until well after dark, nor would he vouchsafe any explanation of the consequent lateness of supper. Nor could he be found shortly after the evening meal when Virginia sought him. Not until the camp was wrapped in the quiet of slumber did Sing Lee return—stealthy and mysterious—to creep under cover of a moonless night to the door of the workshop. How he gained entrance only Sing Lee knows, but a moment later there was a muffled crash of broken glass within the laboratory, and the Chinaman had slipped out, relocked the door, and scurried to his nearby shack. But there was no occasion for his haste—no other ear than his had heard the sound within the workshop. It was almost nine the following morning before Professor Maxon and von Horn entered the laboratory. Scarcely had the older man passed the doorway than he drew up his hands in horrified consternation. Vat Number Thirteen lay dashed to the floor—the glass cover was broken to a million pieces—a sticky, brownish substance covered the matting. Professor Maxon hid his face in his hands. “God!” he cried. “It is all ruined. Three more days would have—”