In each of these cases, we might say that the table 33) is a rule of the game. But in each one this rule plays a different rôle. In 33) the table is an instrument used in what we should call the practice of the game. It is replaced in 36) by the working of association. In 37) even this shadow of the table has dropped out of the practice of the game, and in 38) the table is admittedly an instrument for the training of B only.