His body tingled from head to foot with a not unpleasant sensation that conveyed the assurance of radical changes taking place under the influence of the vital rays. The tingling sensation increased in intensity until it seemed that every corpuscle in his veins danced to the tune of the vibration from those glowing tubes that bathed him in an ever-spreading radiance. Aches and pains vanished from his body, but he soon experienced a sharp stab of new pain in his lower jaw. With an experimental forefinger he rubbed the gum. He laughed aloud as the realization came to him that in those gums where there had been no teeth for more than twenty years there was now growing a complete new set. And the rapidity of the process amazed him beyond measure. The aching area spread quickly and was becoming really uncomfortable. But then--and he consoled himself with the thought--nothing is brought into being without a certain amount of pain. Besides, he was confident that his discomfort would soon be over. He examined his hand, and found that the joints of two fingers long crippled with rheumatism now moved freely and painlessly. The misty brilliance surrounding his body was paling and he saw that the flesh was taking on a faint green fluorescence instead. The rays had completed their work and soon the transformation would be fully effected. He turned on his side and slipped to the floor with the agility of a youngster. The dog snarled anew, but kept steadfastly to his position. * * * * * There was a small mirror over the wash stand at the far end of the room and Old Crompton made haste to obtain the first view of his reflected image. His step was firm and springy, his bearing confident, and he found that his long-stooped shoulders straightened naturally and easily. He felt that he had taken on at least two inches in stature, which was indeed the case. When he reached the mirror he peered anxiously into its dingy surface and what he saw there so startled him that he stepped backward in amazement. This was not Larry Crompton, but an entirely new man. The straggly white hair had given way to soft, healthy waves of chestnut hue. Gone were the seams from the leathery countenance and the eyes looked out clearly and steadily from under brows as thick and dark as they had been in his youth. The reflected features were those of an entire stranger. They were not even reminiscent of the Larry Crompton of fifty years ago, but were the features of a far more vigorous and prepossessing individual than he had ever seemed, even in the best years of his life. The jaw was firm, the once sunken cheeks so well filled out that his high cheek bones were no longer in evidence. It was the face of a man of not more than thirty-eight years of age, reflecting exceptional intelligence and strength of character.