A Treatise on Painting, by Leonardo da Vinci
1721
Senex and Taylor, London
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The Jonctures of the Fingers, grow bigger on every side when they are bent; the more they are bent, the more this appears, and the more they are streightened, the less do they again grow: The same thing happens in the Toes, and is always more sensible as they are bigger and more fleshy.