UNPUBLISHED SHEETS OF LEONARDO DA VINCI

THE THORAX AND THE ABDOMEN

This label identifies the contents as part of a prestigious late 19th-century facsimile edition by the Parisian publisher Rouveyre, who specialized in reproducing Leonardo's manuscripts from the Royal Collection at Windsor.

Conclusion on the impact of air

in the midst of water, or of water within air

Let air be one medium and water the other medium, and let the surface that divides them be flat; and let the impact be made by a stone or other heavy falling body original: "grave cadente" from the air into the water. I say that the motion of the water will not be of a single quality, but will vary according to the variety of the position where the aforementioned heavy body strikes. Because if the heavy body is round and strikes flatly, it will drive the water in every direction equally; and if the heavy body is oblique meaning tilted or striking at an angle, it will drive the water more to one side than the other. And if the heavy body is flat and strikes flatly, it will drive the water in every direction equally; and if the heavy body is oblique, it will drive the water more to one side than the other. ...? motion of the air in the midst of the water, which will be of ...? and of ...? as is seen ...? impact of the water ...? will be made by the motion of the air ...? surface of the water. ...? of the air within the water ...? which moves? with a winding? motion likely referring to the turbulent or spiral path of air bubbles rising through water.

Of the motion of light through media

of varying density or rarity Leonardo uses "rarity" to describe substances that are less dense, such as air compared to water.