Quella cavsa, che move li umori in tutte le spetie de’ corpi animati e che co quelle soccorre a ogni lesione, move l’ acqua dall’ infima profodita del mare alla soma altezza de’ moti, e come l’ acqua si leua dalle inferiori parti della vite all’alte tagliature.

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The same cause which stirs the humours (body fluids) in every species of animal body and by which every injury is repaired, also moves the waters from the utmost depth of the sea to the greatest heights.

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- Leonardo da Vinci

He is relating the blood pressure of living bodies and how when we bleed it forms clotting to the earth’s water cycle. 

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Sketches by Leonardo da Vinci for his now lost painting: Leda and the Swan. He drew highly detailed versions of her face with different braids and expressions. 

  • Studies for the head of Leda, c. 1505 -1506,  Pen and ink over black chalk , 20 x 16.2 cm, Royal Collection Trust, Windsor Castle, London, U.K.
  •  The head of Leda, c. 1505 - 1506, Pen and Ink, 9.2 x 11.2 cm, Royal Collection Trust, Windsor castle, London, U.K
  • The Head of Leda, c. 1504-1506, Pen & ink over black chalk, 17.7 x 14.7 cm, Royal Collection Trust, Windsor Castle,  London, U.K.
  •  The head of Leda, c. 1504-1506, 17.7 x 14.7 cm, Royal Collection Trust, Windsor Castle, London, U.K.

Anatomy sketches of bear feet. For a long time people used to believe these were fantasy drawings of monster feet until later in history when animal anatomists recognized them.

Discoveringdavinci.com