Chap. LXXXII.—Of Motion.
Whether a man moves with velocity or slowness, the parts above the leg which sustains the weight, will always be lower than the others on the opposite side.
Chap. LXXXIII.—The Level of the Shoulders.
The shoulders or sides of a man, or any other animal, will preserve less of their level, in proportion to the slowness of their motion; and, vice versâ, those parts will lose less of their level when the motion is quicker. This is proved by the ninth proposition, treating of local motions, where it is said, any weight will press in the direction of the line of its motion; therefore the whole moving towards any one point, the parts belonging to it will follow the shortest line of the motion of its whole, without giving any of its weight to the collateral parts of the whole.
Plate 11.
London, Published by J. Taylor High Holborn.