A rare survival from the 16th century, this working notebook of the Italian architect and sculptor Bartolomeo Ammannati (1511–92) contains designs for and textual descriptions of fortifications, systems of measurement, preparatory drawings for busts and other sculptures, and a lengthy text on the elements of architectural expression. Ammannati trained with Baccio Bandinelli in Florence and had commissions in Venice, Padua, Urbino, Naples and Rome, in addition to the work he did for Grand-Duke of Tuscany Cosimo I de’ Medici (1519–74) in his hometown of Florence. The 114 folio leaves of the notebook are filled with sketches, half-completed ornamental designs, compositions for sculptures, and architectural renderings of facades, doorways, and window treatments. Among the noteworthy items in the notebook are drawings of the fireplace for the great room of Leo X in the Palazzo Vecchio and a design for the bust of Cosimo I. The texts are in Italian, written in a clear hand.