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 architecture, mechanics, optics, hydrostatics, astronomy, and Nature in general, in all her operations ; and the result of his observations and experiments, which were intended not only for present use, but as the basis and foundation of future discoveries, he determined, as he proceeded, to commit to writing. At what time he began these his collections, of which we shall have occasion to speak more particularly hereafter, is no where mentioned; but it is with certainty known, that by the month of April, he had already completely filled two folio volumes.

Notwithstanding Leonardo’s propensity and application to study, he was not inattentive to the graces of external accomplishments; he was very skilful in the management of an horse, rode gracefully, and when he afterwards arrived to a state of affluence, took particular pleasure in appearing in public well mounted and handsomely accoutred. He possessed great dexterity in the use of arms: for mien and grace he might contend with any gentleman of his time: his person was remarkably handsome, his behaviour so perfectly polite, and his conversation so charming, that his company was coveted by Rh