Comments briefly on Leonardo's references to the elements and the four primary qualities (heat, cold, dryness, and humidity) in relation to comets, and suggests sources for his information. Passages quoted are from the Codex Hammer, Armand Hammer collection.
Sauf mention contraire ci-dessus, le contenu de cette notice bibliographique peut être utilisé dans le cadre d'une licence CC BY 4.0 / Unless otherwise stated above, the content of this bibliographic record may be used under a CC BY 4.0 license