This slight explanation will be sufficient to show what is the essential basis of second sight, and I will add that a secret and unnoticeable correspondence existed between my son and myself, by which I could announce to him the name, nature, and bulk of objects handed me by spectators. As none understood my mode of action, they were tempted to believe in something extraordinary, and, indeed, my son Emile, then aged twelve, possessed all the essential qualities to produce this opinion, for his pale, intellectual, and ever thoughtful face represented the type of a boy gifted with some supernatural power. Two months were incessantly employed in erecting the scaffolding of our tricks, and when we were quite confident of being able to contend against the difficulties of such an undertaking, we announced the first representation of second sight. On the 12th of February, 1846, I printed in the centre of my bill the following singular announcement: “_In this performance M. Robert-Houdin’s son, who is gifted with a marvellous second sight, after his eyes have been covered with a thick bandage, will designate every object presented to him by the audience_.” I cannot say whether this announcement attracted any spectators, for my room was constantly crowded, still I may affirm, what may seem very extraordinary, that the experiment of second sight, which afterwards became so fashionable, produced no effect on the first performance. I am inclined to believe that the spectators fancied themselves the dupes of accomplices, but I was much annoyed by the result, as I had built on the surprise I should produce; still, having no reason to doubt its ultimate success, I was tempted to make a second trial, which turned out well. The next evening I noticed in my room several persons who had been present on the previous night, and I felt they had come a second time to assure themselves of the reality of the experiment. It seems they were convinced, for my success was complete, and amply compensated for my former disappointment. I especially remember a mark of singular approval with which one of my pit audience favored me. My son had named to him several objects he offered in succession; but not feeling satisfied, my incredulous friend, rising, as if to give more importance to the difficulty he was about to present, handed me an instrument peculiar to cloth merchants, and employed to count the number of threads. Acquiescing in his wish, I said to my boy, “What do I hold in my hand?” “It is an instrument to judge the fineness of cloth, and called a thread counter.” “By Jove!” my spectator said, energetically, “it is marvellous. If I had paid ten francs to see it, I should not begrudge them.” From this moment my room was much too small, and was crowded every evening.