[50] Borghini, Donatello's earliest work. Semper, 1406. Schmarsow, 1412. Bode, before the second journey to Rome in 1433. Reymond, 1435.

[51] E.g., on the Or San Michele niche, round the Trinity. Verrocchio also used it on his sketch model for the Forteguerri tomb, Victoria and Albert Museum, No. 7599, 1861.

[52] E.g., Pacifico tomb about 1438 and the Francesco Foscari tomb about 1457, both in the Frari.

[53] "Due Trattati di Benvenuto Cellini," ed. Carlo Milanesi, 1857. Ch. 6 on marble.

[54] Cf. Putti on the Roman Tabernacle.

[55] Bocchi, p. 316.

[56] "Memoriale di molte statue e pitture della città di Firenze," 1510.

[57] Or San Michele niche, San Lorenzo Evangelists.

[58] In the Berlin Gallery.

[59] Berlin Museum.