He looked first at me, and then at the picture, in the most leisurely way, like an expert in painting examining a work of art, without any other motive than that of establishing its authenticity. If this man had procured the death of him whose portrait he studied thus, his power over himself was indeed wonderful. But--was not the experiment a crucial one for him? To betray his trouble would be to avow all? How ardently I longed to place my hand upon his heart at that moment and to count its beats. "You do resemble him," he said at length, "but not to that degree. The lower part of the chin especially, the nose and the mouth, are alike, but you have not the same look in the eyes, and the brows, forehead, and cheeks are not the same shape." "Do you think," said I, "that the resemblance is strong enough for me to startle the murderer if he were to meet me suddenly here, and thus?"--I advanced upon him, looking into the depths of his eyes as though I were imitating a dramatic scene. "Yes," I continued, "would the likeness of feature enable me to produce the effect of a specter, on saying to the man, 'Do you recognize the son of him whom you killed?"' "Now we are returning to our former discussion," he replied, without any farther alteration of his countenance; "that would depend upon the man's remorse, if he had any, and on his nervous system." Again we were silent. His pale and sickly but motionless face exasperated me by its complete absence of expression. In those minutes--and how many such scenes have we not acted together since my suspicion was first conceived--I felt myself as bold and resolute as I was the reverse when alone with my own thoughts. His impassive manner drove me wild again; I did not limit myself to this second experiment, but immediately devised a third, which ought to make him suffer as much as the two others, if he were guilty. I was like a man who strikes his enemy with a broken- handled knife, holding it by the blade in his shut hand; the blow draws his own blood also. But no, no; I was not exactly that man; I could not doubt or deny the harm that I was doing to myself by these cruel experiments, while he, my adversary, hid his wound so well that I saw it not. No matter, the mad desire TO KNOW overcame my pain. "How strange those resemblances are," I said. "My father's handwriting and mine are exactly the same. Look here."