The long study which he had made of heredity, his important researches, his works, completed the poisoning of his peace, furnishing him with ever renewed causes of disquietude. To the question which he put to himself continually as to his own hereditary case, the documents were there to answer it by all possible combinations. They were so numerous that he lost himself among them now. If he had deceived himself, if he could not set himself apart, as a remarkable case of variation, should he place himself under the head of reversional heredity, passing over one, two, or even three generations? Or was his case rather a manifestation of larvated heredity, which would bring anew proof to the support of his theory of the germ plasm, or was it simply a singular case of hereditary resemblance, the sudden apparition of some unknown ancestor at the very decline of life? From this moment he never rested, giving himself up completely to the investigation of his case, searching his notes, rereading his books. And he studied himself, watching the least of his sensations, to deduce from them the facts on which he might judge himself. On the days when his mind was most sluggish, or when he thought he experienced particular phenomena of vision, he inclined to a predominance of the original nervous lesion; while, if he felt that his limbs were affected, his feet heavy and painful, he imagined he was suffering the indirect influence of some ancestor come from outside. Everything became confused, until at last he could recognize himself no longer, in the midst of the imaginary troubles which agitated his disturbed organism. And every evening the conclusion was the same, the same knell sounded in his brain—heredity, appalling heredity, the fear of becoming mad. In the early part of January Clotilde was an involuntary spectator of a scene which wrung her heart. She was sitting before one of the windows of the study, reading, concealed by the high back of her chair, when she saw Pascal, who had been shut up in his room since the day before, entering. He held open before his eyes with both hands a sheet of yellow paper, in which she recognized the genealogical tree. He was so completely absorbed, his gaze was so fixed, that she might have come forward without his observing her. He spread the tree upon the table, continuing to look at it for a long time, with the terrified expression of interrogation which had become habitual to him, which gradually changed to one of supplication, the tears coursing down his cheeks.