Heredity, finally Mr. Darrow says; the family, or some ancestor away back, planted the seed here. Hereditary influence. Well, let's see what their doctor's say, on page 139: "There is nothing about the patient's condition to show any evidence of a hereditary nature, and there is not the slightest reason to suppose that a condition of this kind will be transmitted to future generations by any of his siblings or relatives. This condition is acquired within the life history of the individual, and dies out when he dies." It is something of his own construction, and his ancestors are in no degree responsible for it. It will die out when he dies out.