If you would have the neck of the busto tinged of a very florid and lively complexion, the pencil must be dipt in the bloom tints of each colour as they stand one above another at No. 4.--if for a less florid, in those of No. 5--if for a very fair, from No. 6--and so on till the marble would scarce be ting'd at all: let therefore No. 6, be our present choice, and begin with penciling on the red, as at r, the yellow tint at y, the blue tint at b, and the purple or lake tint at p. These four tints thus laid on, proceed to covering the whole neck and breast, but still changing and varying the situations of the tints with one another, also causing their shapes and sizes to differ as much as possible; red must be oftenest repeated, yellow next often, purple red next, and blue but seldom, except in particular parts as the temples, backs of the hands, &c. where the larger veins shew their branching shapes (sometimes too distinctly) still varying those appearances. But there are no doubt infinite variations in nature, from what may be called the most beautiful order and disposition of the colours in flesh, not only in different persons, but in different parts of the same, all subject to the same principles in some degree or other. Now if we imagine this whole process to be made with the tender tints of class 7, as they are supposed to stand, red, yellow, blue, green and purple, underneath each other; the general hue of the performance will be a seeming uniform prime tint, at any little distance, that is a very fair, transparent and pearl-like complexion; but never quite uniform as snow, ivory, marble or wax, like a poet's mistress, for either of these in living-flesh, would in truth be hideous. As in nature, by the general yellowish hue of the cuticula, the gradating of one colour into another appears to be more delicately soften'd and united together; so will the colours we are supposed to have been laying upon the busto, appear to be more united and mellowed by the oils they are ground in, which takes a yellowish cast after a little time, but is apt to do more mischief hereby than good; for which reason care is taken to procure such oil as is clearest, and will best keep its colour[18] in oil painting.