The second bill features Don Carlo, the Double-Sighted dog, which gave an exhibition of his mysterious skill at the Pavillion by special command, before King William and the royal family on December 17th, 1831. This dog was blindfolded and could present almost in duplicate the second-sight tests offered by the Highland lad who five days later gave a similar exhibition before the royal family at the same place. [Illustration: Rare poster announcing the performance of the learned goose, one of the first of the second-sight animal artists. Traced from the original poster in the British Museum by the author.] [Illustration: Billing used for Don Carlos, the double-sighted dog. From the Harry Houdini Collection.] This proof regarding the use of animals as "mediums" is offered not to belittle the human mediums, but to prove that from start to finish, from the day that Breslaw offered the trick to the present moment, when a number of skilful so-called mind-readers still mystify the public, some sort of speaking or signal code has been used. Robert-Houdin used both the speaking and the signal code, but so did Breslaw, and all evidence points to the fact that Robert-Houdin merely improved upon the trick employed by Breslaw, Pinetti, and others among his predecessors in magic, by utilizing the newly found assistant to the magician, electricity. In his tiny theatre it would have been entirely feasible to have had electric wires run from all points of the auditorium to the stage, thus doing away with both the speaking and ordinary signal codes, even the pneumatic tube. For this improvement, and this alone, should Robert-Houdin be given credit. Nearly all magicians improve or redress tricks or apparatus handed down to them by their predecessors, but Robert-Houdin was not willing to admit that he owed anything to his predecessors. CHAPTER VIII THE SUSPENSION TRICK In chapters XVI. and XVII. of the American edition of his "Memoirs," Robert-Houdin states that he closed his theatre during the months of July, August, and September, 1847, and devoted his time to producing new tricks for the coming season. He chronicles as the result of these labors the following additions to his répertoire: "The Crystal Box," "The Fantastic Portfolio," "The Trapeze Tumbler," "The Garde Française," "The Origin of Flowers," "The Crystal Balls," "The Inexhaustible Bottle," "The Ethereal Suspension," etc.