Trattato d'aritmetica
This is a manuscript arithmetic treatise dated 1700, held by the Burndy Library and digitised by Smithsonian Libraries, written as a handbook of commercial calculation in Italian. Its pages are handwritten worked sums on cream paper, with Italian text and ruled rules of three, sketched on the same pages with pencil drawings of a moth, a butterfly, and a flowering sprig. A designer might take from them the loose, hand-drawn botanical and insect sketches overlaid with ink figures, a combination suited to naturalistic sketchbook or vintage specimen styling.
