[156] Spinello degli Spinelli was born of a Ghibelline family, exiled from Florence, who settled at Arezzo about 1308. He died at Arezzo in 1410, aged 92, according to some computations. [157] South wall of the Campo Santo, on the left-hand of the entrance. [158] In the Sala di Balia of the public palace at Siena. [159] See _Inferno_, xxix. 121; the sonnets on the months by Cene dalla Chitarra, _Poeti del Primo Secolo,_ vol. ii. pp. 196-207; the epithet "Molles Senae," given by Beccadelli; and the remarks of De Comines. [160] I have not thought it necessary to distinguish between tempera and fresco. In tempera painting the colours were mixed with egg, gum, and other vehicles dissolved in water, and laid upon a dry ground. In fresco painting the colours, mixed only with water, were laid upon plaster while still damp. The latter process replaced the former for wall-paintings in the fourteenth century. CHAPTER V PAINTING Mediaeval Motives exhausted--New Impulse toward Technical Perfection--Naturalists in Painting--Intermediate Achievement needed for the Great Age of Art--Positive Spirit of the Fifteenth Century--Masaccio--The Modern Manner--Paolo Uccello--Perspective--Realistic Painters--The Model--Piero della Francesca--His Study of Form--Resurrection at Borgo San Sepolcro--Melozzo da Forli--Squarcione at Padua--Gentile da Fabriano--Fra Angelico--Benozzo Gozzoli--His Decorative Style--Lippo Lippi--Frescoes at Prato and Spoleto--Filippino Lippi--Sandro Botticelli--His Value for the Student of Renaissance Fancy--His Feeling for Mythology--Piero di Cosimo--Domenico Ghirlandajo--In what sense he sums up the Age--Prosaic Spirit--Florence hitherto supreme in Painting--Extension of Art Activity throughout Italy--Medicean Patronage.