50. When the striker’s, and either of the other balls are so close as to touch, and in playing the former off, the latter is moved from its place, the stroke is considered foul. 51. If the striker, in attempting a stroke, do not touch his ball, it is no stroke, and he must strike again. 52. If, when the balls are very near each other, the striker should make his ball touch the other, it is to be considered a stroke, though not intended as such. 53. If the striker play upon a ball which is still running, the stroke is foul. 54. Whoever stops a ball when running, loses the lead; if his adversary do not like the ball he has to play at the next stroke. 55. Whoever retains his adversary’s cue or mace, when in the act of striking, makes the stroke foul. 56. If the striker interrupt the course of his own ball, when running towards a hole, after having made a miss, and it is the opinion of the marker that it would have entered the pocket, had it not been interrupted, he loses three points. 57. And if the striker should interrupt, stop, or put his adversary’s ball out of its course, when running towards or into a hole, he is subjected to the same forfeiture. 58. If the striker, after having made a hazard, or carambole, interrupt the course of his own ball, the stroke is foul, and he cannot score any of the points he may have thus made. 59. He who blows upon a ball when running makes the stroke foul; and if his own ball were running towards a hole, or near a hole, and he be seen by his adversary to blow upon it, he loses two points. 60. If the striker play with both feet off the ground, the stroke is deemed foul. 61. Whoever strikes the table when the ball is running, makes the stroke foul. 62. If the striker throws his mace or cue upon the table so as to baulk his adversary, he causes him to make a foul stroke. 63. If a ball be made to go extremely near the brink of a hole, and after sensibly standing still, falls into it, the striker wins nothing, and the ball must be put on the same brink where it stood before the adversary makes his next stroke; and if it should fall into the hole at the instant the striker hath played upon his ball, so as to prevent the success of his stroke, the striker’s and the adversary’s balls must be placed in the same relative position, and the striker play again. 64. He who will not play the game out, loses the same. 65. If a person agree to play with the cue, he is obliged to play with it during the whole of the game or match; but if no agreement have been made, he may at any time change it for the mace, and _vice versâ_. But when the parties agree to play mace against cue, the mace player has no right to use a cue, nor has the cue player any right to use a mace, without permission.