NOTE HH.—Par. 865.
The colouring of Paolo Uccello, according to Vasari's account of him, was occasionally so remarkable that he might perhaps have been fairly included among the instances of defective vision given by the author. His skill in perspective, indicating an eye for gradation, may be also reckoned among the points of resemblance (see Par. 105).
NOTE II.—Par. 902.
The quotation before given from Boschini shows that the method described by the author, and which is true with regard to some of the Florentine painters, was not practised by the Venetians, for their first painting was very solid. It agrees, however, with the manner of Rubens, many of whose works sufficiently corroborate the account of his process given by Descamps. "In the early state of Rubens's pictures," says that writer,199 "everything appeared like a thin wash; but although he often made use of the ground in producing his tones, the canvas was entirely covered more or less with colour." In this system of leaving the shadows transparent from the first, with the ground shining through them, it would have been obviously destructive of richness to use white mixed with the darks, the brightness, in fact, already existed underneath. Hence the well-known precept of Rubens to avoid white in the shadows, a precept, like many others, belonging to a particular practice, and involving all the conditions of that practice.200 Scarmiglione, whose Aristotelian treatise on colour was published in Germany when Rubens was three-and-twenty, observes, "Painters, with consummate art, lock up the bright colours with dark ones, and, on the other hand, employ white, the poison of a picture, very sparingly." (Artificiosissimè pictores claros obscuris obsepiant et contra candido picturarum veneno summè parcentes, &c.)
NOTE KK.—Par. 903.