These are the simplest signs; but some of the Greeks have a great
number of them, to designate everything; and even sometimes to
communicate and receive intelligence, when necessary. This
telegraphy is so imperceptible that it is difficult to describe
it, and altogether impossible to detect it.[7]
[7] Tricheries des Grecs devoilees.
Robert-Houdin has exhausted the subject of card-trickery, in
connection with that prestidigitation which, it seems, all card-
sharpers cultivate, the description of which, however, is by no
means so entertaining as the visible performance. I find,
nevertheless, in his book, under the title of 'Small Trickeries
made innocent by Custom,' certain things alluded to which I can
attest by experience.
I. At Whist, no communication whatever must be made by a player
to his partner, excepting those authorized by the laws of the
game; but some persons go further, and by the play of their
features 'telegraph' to their partners the value of their hands.
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