It is of importance that the person matched against the Automaton, should be attentive, in moving a piece, to place it precisely in the centre of its square; otherwise the figure, in attempting to lay hold of the piece, may miss its hold, or even sustain some injury in the delicate mechanism of the fingers. When the person has made a move, no alteration in it can take place: and if a piece be touched, it must be played somewhere. This rule is strictly observed by the Automaton. If its antagonist hesitates to move for a considerable time, it taps smartly on the top of the chest with the right hand, which is constantly extended upon it, as if testifying impatience at his delay. During the time that the Automaton is in motion, a low sound of clock-work running down is heard, which ceases soon after its arm returns to the cushion; and then its antagonist may make his move. The works are wound up at intervals, after ten or twelve moves, by the exhibiter, who is usually employed in walking up and down the apartment in which the Automaton is shown, approaching, however, the chest from time to time, especially on its right side. At the conclusion of the exhibition of the Automaton, on the removal of the chess men from the board, one of the spectators indiscriminately is requested to place a Knight upon any square of the board at pleasure. The Automaton immediately takes up the Knight, and beginning from that square, it moves the piece, according to its proper motion, so as to touch each of the sixty-three squares of the chess board in turn, without missing one, or returning to the same square. The square from which the Knight proceeds is marked by a white counter; and the squares successively touched, by red counters, which at length occupy all the other squares of the board. The description now given of the Automaton Chess Player, with respect to its construction, so far as that can be explained, and its general manner of working, naturally suggests an interesting inquiry: What are the immediate causes by which its unparalleled phenomena are produced?