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by a rope, and it was struck horizontally by the hammer. Thus is the velocity given by the hammer distributed to all parts of a great stone, when it is laid on a man's breast to be broken; but when the blow is given, the man feels less of the weight of the stone than he did before, because in the reaction of the stone, all the parts of it round about the hammer rise towards the blow; and if the tenacity of the parts of the stone, is not stronger than the force with which it moves towards the hammer, the stone must break; which it does when the blow is strong, and struck upon the centre of gravity of the stone.

In the 5th Fig. of Plate 19, the man IHL (the chairs IL, being made fast) makes so strong an arch with his backbone and the bones of his legs and thighs, as to be able not only to sustain one man, but three or four, if they had room to stand; or, in their stead, a great stone to be broken with one blow.

In the 6th and 7th Fig. of the same plate, a man or two are raised in the direction CM, by the knees of the strong man IHL lying upon his back A trial will suffice to show that this is not a difficult feat for a man of ordinary strength.