Head of an old man with a turban and beard, four smaller heads of young people at the corners, plate 9 from 'I principii del disegno' (The Principles of Design), c. 1641, Stefano della Bella; Publisher: Pierre Mariette I, Italian (Florence), Italian (Florence), 1610¡V1664, 4 5/8 ¡Ñ 6 in. (11.75 ¡Ñ 15.24 cm) (plate)5 5/8 ¡Ñ 6 11/16 in. (14.29 ¡Ñ 16.99 cm) (sheet), Etching, France, 17th century, The accomplished Florentine etcher and draftsman Stefano della Bella produced this drawing manual in France, where he spent over a decade of his career. The book, now disassembled, comprised 25 etchings and was published by della Bella¡¦s principal French publisher Pierre Mariette.