This old painter was born at Florence in 1349, and was a disciple of Antonio Veneziano. His name was Mazzocchi, but being very celebrated as a painter of animals, and especially so of birds, of which last he formed a large collection of the most curious, he was called Uccello (bird). He was one of the first painters who cultivated perspective. Before his time buildings had not a true point of perspective, and figures appeared sometimes as if falling or slipping off the canvass. He made this branch so much his hobby, that he neglected other essential parts of the art. To improve himself he studied geometry with Giovanni Manetti, a celebrated mathematician. He acquired great distinction in his time and some of his works still remain in the churches and convents of Florence. In the church of S. Maria Novella are several fresco histories from the Old Testament, which he selected for the purpose of introducing a multitude of his favorite objects, beasts and birds; among them, are Adam and Eve in Paradise, Noah entering the Ark, the Deluge, &c. He painted battles of lions, tigers, serpents, &c, with peasants flying in terror from the scene of combat. He also painted landscapes with figures, cattle and ruins, possessing so much truth and nature, that Lanzi says "he may be justly called the Bassano of his age." He was living in 1436. Vasari places his birth in 1396-7, and his death in 1479, but later writers have proved his dates to be altogether erroneous. UCCELLO'S ENTHUSIASM. "Paolo Uccello employed himself perpetually and without any intermission," says Vasari, "in the consideration of the most difficult questions connected with art, insomuch that he brought the method of preparing the plans and elevations of buildings, by the study of linear perspective, to perfection. From the ground plan to the cornice, and summit of the roof, he reduced all to strict rules, by the convergence of intersecting lines, which he diminished towards the centre, after having fixed the point of view higher or lower, as seemed good to him; he labored, in short, so earnestly in these difficult matters that he found means, and fixed rules, for making his figures really to seem standing on the plane whereon they were placed; not only showing how in order manifestly to draw back or retire, they must gradually be diminished, but also giving the precise manner and degree required for this, which had previously been done by chance, or effected at the discretion of the artist, as he best could. He also discovered the method of turning the arches and cross-vaulting of ceilings, taught how floors are to be foreshortened by the convergence of the beams; showed how the artist must proceed to represent the columns bending round the sharp corners of a building, so that when drawn in perspective, they efface the angle and cause it to seem level. To pore over all these matters, Paolo would remain alone, almost like a hermit, shut up in his