A treatise on painting . re. Thisciofeof theday ^q\\q^^ f^om what wc havc already iTiewn, viz. appear azure. • That the furface of every opake body partakesof the colour of its objedt; whence, the vvhite-nefs of the wall, being altogether dellitute ofcolour, muft afiume thofe of its objedts;which, in this cafe, arc the fun and the hea-vens : and fince the fun in his evenings vilitto the horizon, appears reddifh, and the hea-vens azure; and lince thofe places where thefhadows are found, are out of the reach of thefun ; we having elfewhere proved, that no lu-minous body has ever feen the fliadow
A treatise on painting . re. Thisciofeof theday ^q\\q^^ f^om what wc havc already iTiewn, viz. appear azure. • That the furface of every opake body partakesof the colour of its objedt; whence, the vvhite-nefs of the wall, being altogether dellitute ofcolour, muft afiume thofe of its objedts;which, in this cafe, arc the fun and the hea-vens : and fince the fun in his evenings vilitto the horizon, appears reddifh, and the hea-vens azure; and lince thofe places where thefhadows are found, are out of the reach of thefun ; we having elfewhere proved, that no lu-minous body has ever feen the fliadow of anybody illuminated by it; it is obvious, that thefliadovv of the heavens, projedfcd on the whiteAvail, will appear azure; and further, that thegromid of that (hadow, being illumined by thefun, will appear reddifh, in conformity to thertdnefs of its That fmoke, which is interpofcd between the fun and the eve that fees it, muft appear bright-er and more tranfparent than thcfmoke feen in any PI. 22. BY LEONARDO DA VINCI. 167 any other parr of the painting. The famething mav be obfcrvcd of du^-, fog, and otherlike bodies, which ojeht always to appear ob-fc^ure, when you are placed between them andthe fun. Smoke is more tranfparenr, and of a colourlefs deep, towards tlVe extremes of its maiTcs,than in the center, and towards the middle. Smoke rifes more obliquely, as the wind whichdrives it is more flrong and violent. Smoke appears under as many different co-lours as there are different caufes to produceit. Smoke never ^:rojecls any fliadows that arebold and defined, and its extremes weaken bylittle and little ; becoming infenfible as it re-moves further from its origin. Thofe objedtswhich are fetn through it appear fo much thelefs fenfible, as it is more denfe; and it is foundfo much the whiter as it is nearer its principle,and the more blucifh as it is further removed. Fire appears more obfcure, as there is a great-er quantity of fmoke found between
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