22: lasciando stare li autori. In this observation we may detect an indirect evidence that Leonardo regarded his knowledge of natural history as derived from his own investigations, as well as his theories of perspective and optics. Compare what he says in praise of experience (Vol II; XIX).], setting aside those authorities who themselves were the disciples of nature.
661.
That the first drawing was a simple line drawn round the shadow of a man cast by the sun on a wall.
The painter's scope.
662.
The painter strives and competes with nature.
_X.
Studies and Sketches for Pictures and Decorations.
An artist's manuscript notes can hardly be expected to contain any thing more than incidental references to those masterpieces of his work of which the fame, sounded in the writings of his contemporaries, has left a glorious echo to posterity.