[9] The word _Macchia_, literally a blot, is generally used by Italian writers, by Vasari for instance, for the local colour. Boschini understands by it the relative depth of tones rather than the mere difference of hue. "By macchia," he says, "I understand that treatment by which the figures are distinguished from each other by different tones lighter or darker."--_La Carta del Navegar_, p. 328. Elsewhere, "Colouring (as practised by the Venetians) comprehends both the macchia and drawing;" (p. 300) that is, comprehends the gradations of light and dark in objects, and the parts of objects, and consequently, their essential form. "The macchia," he adds, "is the effect of practice, and is dictated by the knowledge of what is requisite for effect." [10] "Ma l'arivar a la maniera, al trato (Verbi gratia) de Paulo, del Bassan, Del Vechio, Tentoreto, e di Tician, Per Dio, l'è cosa da deventar mato."--p. 294, 297. [11] The traces of the Aristotelian theory are quite as apparent in Boschini as in the other Italian writers on art; but as he wrote in the seventeenth century, his authority in this respect is only important as an indication of the earlier prevalence of the doctrine. NOTE Y.--Par. 672. The author's conclusion here is unsatisfactory, for the colour of the black races may be considered at least quite as negative as that of Europeans. It would be safer to say that the white skin is more beautiful than the black, because it is more capable of indications of life, and indications of emotion. A degree of light which would fail to exhibit the finer varieties of form on a dark surface, would be sufficient to display them on a light one; and the delicate mantlings of colour, whether the result of action or emotion, are more perceptible for the same reason. NOTE Z.--Par. 690. The author appears to mean that a degree of brightness which the organ can bear at all, must of necessity be removed from dazzling, white light. The slightest tinge of colour to this brightness, implies that it is seen through a medium, and thus, in painting, the lightest, whitest surface should partake of the quality of depth. Goethe's view here again accords, it must be admitted, with the practice of the best colourists, and with the precepts of the highest authorities.--See Note C. NOTE A A.--Par. 732. Ample details respecting the opinions of Louis Bertrand Castel, a Jesuit, are given in the historical part. The coincidence of some of his views with those of Goethe is often apparent: he objects, for instance, to the arbitrary selection of the Newtonian spectrum; observing that the colours change with every change of distance between the prism and the recipient surface.--_Farbenl._ vol. ii. p. 527. Jeremias Friedrich Gülich was a dyer in the neighbourhood of Stutgardt: he published an elaborate work on the technical details of his own pursuit.--_Farbenl._ vol. ii. p. 630. NOTE B B.--Par. 748.