A Treatise on Painting, by Leonardo da Vinci
1721
Senex and Taylor, London
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That side of the Body, on which a Man bends, is diminished, in proportion as the Opposite side is increased; and the bending or flexure of this side, may, at last, come to be in a Subduple Ratio to the stretching of the other. But this shall be considered in a particular Treatise.