THE PLAYERS AND THEIR POSITIONS.
RULE 16. The players of each club in a game shall be nine in number, one of whom shall act as Captain, and in no case shall less than nine men be allowed to play on each side.
RULE 17. The players' positions shall be such as may be assigned them by their Captain, except that the pitcher must take the position as defined in Rules 8 and 29.
RULE 18. Players in uniform shall not be permitted to occupy seats among the spectators.
RULE 19. SECTION 1. Every club shall adopt uniforms for its players, but no player shall attach anything to the sole or heel of his shoes other than the ordinary base ball shoe plate.