sentences:  In effect, nothing is easier at piquet than to indicate, by the aid of these signals, the colour in which the player should discard and that in which he should keep what cards he has.These are the simplest signs; but some of the [cheaters] 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.