"See? See?" shouted Tom, grasping Old Crompton by the arm in a viselike grip. "It is the secret of life and death! Aristocrats, plutocrats and beggars will beat a path to my door. But, never fear, I shall choose my subjects well. The name of Thomas Forsythe will yet be emblazoned in the Hall of Fame. I shall be master of the world!" Old Crompton began to fear the glitter in the eyes of the gaunt young man who seemed suddenly to have become demented. And his envy and hatred of his talented host blazed anew as Forsythe gloried in the success of his efforts. Then he was struck with an idea and he affected his most ingratiating manner. "It is a marvelous thing, Tom," he said, "and is entirely beyond my poor comprehension. But I can see that it is all you say and more. Tell me--can you restore the youth of an aged person by these means?" "Positively!" Tom did not catch the eager note in the old man's voice. Rather he took the question as an inquiry into the further marvels of his process. "Here," he continued, enthusiastically, "I'll prove that to you also. My dog Spot is around the place somewhere. And he is a decrepit old hound, blind, lame and toothless. You've probably seen him with me." * * * * * He rushed to the stairs and whistled. There was an answering yelp from above and the pad of uncertain paws on the bare wooden steps. A dejected old beagle blundered into the room, dragging a crippled hind leg as he fawned upon his master, who stretched forth a hand to pat the unsteady head. "Guess Spot is old enough for the test," laughed Tom, "and I have been meaning to restore him to his youthful vigor, anyway. No time like the present." He led his trembling pet to the table of the remarkable tubes and lifted him to its surface. The poor old beast lay trustingly where he was placed, quiet, save for his husky asthmatic breathing. "Hold him, Crompton," directed Tom as he pulled the starting lever of his apparatus. And Old Crompton watched in fascinated anticipation as the ethereal luminosity bathed the dog's body in response to the action of the four rays. Somewhat vaguely it came to him that the baggy flesh of his own wrinkled hands took on a new firmness and color where they reposed on the animal's back. Young Forsythe grinned triumphantly as Spot's breathing became more regular and the rasp gradually left it. Then the dog whined in pleasure and wagged his tail with increasing vigor. Suddenly he raised his head, perked his ears in astonishment and looked his master straight in the face with eyes that saw once more. The low throat cry rose to a full and joyous bark. He sprang to his feet from under the restraining hands and jumped to the floor in a lithe-muscled leap that carried him half way across the room. He capered about with the abandon of a puppy, making extremely active use of four sound limbs.