The figure of the man was not complete from the waist down; his face was concealed. Between them, as they contended, was a child's coffin in the arms of the woman. Overhead were the bare outlines of an arch. The artist hesitated and added behind the group a tree, whose branches seemed to lash the ground. And there memory failed; the crayon fell from his fingers; he stood listless by the canvas. Then with a cry he buried his face in his hands and wept. As he stood thus, the visitor, awed but triumphant, glided through the door and disappeared in the wing-room. He knew that he had touched a hidden chord; that the picture on the canvas was born under the flashlight of memory! Was it brain? Oh, for the wisdom of Virdow! Sympathy moved him to return again to the glass-room. It was empty! CHAPTER VIII. ON THE BACK TRAIL. Edward found himself next day feverish and mentally disturbed; but he felt new life in the morning air. There was a vehicle available; a roomy buggy, after the fashion of those chosen by physicians, with covered tops to keep out the sun, and rubber aprons for the rain. And there was a good reliable horse, that had traveled the city road almost daily for ten years. He finished his meal and started out. In the yard he found Gerald pale and with the contracted pupils that betrayed his deadly habit. He was taking views with a camera and came forward with breathless interest. "I am trying some experiments with photographs on the line of our conversation," he said. "If the mind pictures can be revived they must necessarily exist. Do they? The question with me now is, can any living substance retain a photographic impression? You understand, it seems that the brain can receive these impressions through certain senses, but the brain is transient; through a peculiar process of supply and waste it is always coming and going. If it is true that every atom of our physical bodies undergoes a change at least once in seven years, how can the impressions survive? I have here upon my plate the sensitized film of a fish's eyes; I caught it this morning. I must establish, first, the proposition that a living substance can receive a photographic image; if I can make an impression remain upon this film I have gained a little point--a little one. But the fish should be alive. There are almost insuperable difficulties, you understand! The time will come when a new light will be made, so powerful, penetrating as to illumine solids. Then, perhaps, will the brain be seen at work through the skull; then may its tiny impressions even be found and enlarged; then will the past give up its secrets. And the eye is not the brain." He looked away in perplexity. "If I only had brain substance, brain substance--a living brain!" He hurried away and Edward resumed his journey to the city, sad and thoughtful.