de Cambremer with a laugh. But the doctor enjoyed contradicting no less than teasing, and would on no account allow a layman to talk medicine to him. “People do not imagine that they never sleep,” he promulgated in a dogmatic tone. “Ah!” replied the Marquis with a respectful bow, such as Cottard at one time would have made. “It is easy to see,” Cottard went on, “that you have never administered, as I have, as much as two grains of trional without succeeding in provoking somnolescence.” “Quite so, quite so,” replied the Marquis, laughing with a superior air, “I have never taken trional, or any of those drugs which soon cease to have any effect but ruin your stomach. When a man has been out shooting all night, like me, in the forest of Chantepie, I can assure you he doesn’t need any trional to make him sleep.” “It is only fools who say that,” replied the Professor. “Trional frequently has a remarkable effect on the nervous tone. You mention trional, have you any idea what it is?” “Well⁠ ⁠… I’ve heard people say that it is a drug to make one sleep.” “You are not answering my question,” replied the Professor, who, thrice weekly, at the Faculty, sat on the board of examiners. “I don’t ask you whether it makes you sleep or not, but what it is. Can you tell me what percentage it contains of amyl and ethyl?” “No,” replied