of the wings, the descent will have very little obliquity.
Chap. LXXIV.—Of a Figure moving against the Wind, Plate VIII.
A man moving against the wind in any direction does not keep his centre of gravity duly disposed upon the centre of support[1].
Chap. LXXV.—Of the Balance of a Figure resting upon its Feet.
The man who rests upon his feet, either bears the weight of his body upon them equally, or unequally. If equally, it will be with some accidental weight, or simply with his own; if it be with an additional weight, the opposite extremities of his members will not be equally distant from the perpendicular of his feet. But if he simply carries his own weight, the opposite extremities will be equally distant from the perpendicular of his feet: and on this subject of gravity I shall write a separate book[2].
Chap. LXXVI.—A Precept.
The navel is always in the central or middle line of the body, which passes through the pit of the stomach to that of the neck, and must have as much weight, either accidental or natural, on one side of the human figure as on the other. This is demonstrated by extending the arm, the wrist of which per-
