16. A rover can be pegged out by any stroke (not foul) of another rover, whether of the same or the adverse side. Players can, however, mutually agree before the commencement of the game that rovers shall not be pegged out by adverse rovers. 17. _Rover pegged out by Roquet._--A player (rover) who pegs out a rover by a roquet loses the remainder of his turn because a rover when pegged out is out of the game and croquet cannot be taken from it. The law does not apply when there is no pegging out. 18. _Balls sent off the Ground._--A ball sent off the ground must at once be replaced three feet within the boundary, measured from the spot where it went off, and at right angles to the boundary. If this spot be already occupied, the ball last sent off is to be placed in contact with the other, but no ball is to be placed less or more than three feet from the boundary, the player merely having option whether he place the second ball going off at the same spot to the right or left of the first ball. If a third ball go off on the same spot it must be placed touching the first ball. 19. _Ball sent off near Corner._ A ball sent off within three feet of a corner is to be replaced three feet from both boundaries. If more than one ball be sent off within three feet of any corner, the ball last sent off is to be placed in contact with the ball occupying the corner spot, and three feet from one of the boundaries at the option of the player. When a player roquets one of the corner balls he is entitled to place the balls in any order, provided one is on the corner spot, and the others touch it or some other corner ball; but he must take croquet off the ball he has roqueted. If a player's ball be in a corner with two or more other balls the player is at liberty to choose off which ball he will take croquet, and previous to his doing so he may alter the position of the other balls to his liking, provided one is on the corner spot and the others touching it or some other corner ball. 20. _Ball touching Boundary._--If the boundary be marked by a line on the turf, a ball touching the line is deemed to be off the ground. If the boundary be raised, a ball touching the boundary is similarly deemed to be off the ground. 21. _Ball sent off and returning to Ground._--If a ball be sent off the ground, and return to it, the ball must be similarly replaced, measuring from the point of first contact with the boundary. 22. _Ball sent within three feet of Boundary._--A ball sent within three feet of the boundary, but not off the ground, is to be replaced as though it had been sent off; except in the case of the striker's ball, when the striker has the option of replacing his ball, or of playing from where it lies.