This code is described by various reliable authors. On page 388, Volume III. of Hooper's "Recreations," edition 1782, it is stated that the confederate worked the apparatus from another room. "By certain words, previously agreed on, make it known to the confederate," is the advice given to would-be conjurers. Beckman in his "History of Inventions" relates that he knew an exhibitor of a "talking figure" whose concealed confederate was cued to answer certain questions, the answers being given in the manner of putting the question, also by different signs. These instructions will be found on page 311 of Volume II., edition of 1817. [Illustration: Reproduction of front and back of original handbill distributed on London streets in 1831, to advertise Master M'Kean. From the Harry Houdini Collection.] Decremps undertook to expose Pinetti's method of working the second-sight trick in his famous book, but in this attempt he scored one of the few failures which marked the bitter fight he waged against Pinetti. In his book "La Magie Blanche Dévoilée" (White Magic Exposed), first edition, 1784, he offers on page 40 "Les Cartes dévinées, les yeux bandés" (The Divination of Cards with the Eyes Blindfolded). In this feat Decremps explains that Pinetti would allow cards to be drawn, then a lady (Signora Pinetti) would appear on the stage, would be blindfolded, and would name all the cards that were drawn. Decremps explains the prearranged pack of cards for this trick, also outlining the manner of giving the medium the cue for certain phrases. For instance, while explaining to the audience that he will not speak at all, in the very sentences addressed to the spectators he informs the medium which cards have been selected. Pinetti's code must have been clever, as Decremps was unable to explain the entire second-sight act. He has omitted the principal part of the mystification, that is, naming the articles held up for the performer to see. That the card trick was only one test of his second-sight performance, and that Pinetti's medium did not retire after naming the cards, are facts shown by the following clipping from one of his announcements: "Signora Pinetti will have the special honor and satisfaction of exhibiting various experiments of new discovery, no less curious than seemingly incredible, particularly that of her being seated in one of the front boxes with an handkerchief over her eyes, and guess at everything imagined and proposed to her by any person in the company." Third on the list of second-sight performers, according to the data in my collection, was Louis Gordon M'Kean, who created a sensation at the Egyptian Hall Bazaar, Piccadilly, London, in 1831, or fifteen years before Robert-Houdin, according to his claims, "discovered" second sight. Young M'Kean was featured as possessing double, not second, sight, and one of his bills is reproduced on page 212.