OF BODIES. Cbap.XXX. 331 



refulteth from : but if you ft and foneere that each thredfend- 

 cth rayes enough to your eye , and that the bafts of the triangle 

 which commcth from each thred to ycur eye,be long enough to 

 make at the vertex of it ( which is in your eye ) an angfc big c- 

 nough to be feene fingly by it fclfe ; then each colour will ap- 

 pcare a part as it truly is. 



Now the various natures of middling colours we may learne 

 of painters ; who compoie them upon their palettes by a like 

 mixture of the extremes. And they tell us.that ifa white colour 

 prevailc ftrongly over a darke colour , reds and yeJlowes refalt 

 cut of that mixture : but if black prevaile ftrongly over white, 

 then blewes, violets, and feagreenes are made. And accordingly, 

 in our cafe, we cannct doubt but t! ;at the primary lively picture 

 of the white, mutt prevaile over the faint dusky fable mantle 

 with which it commeth mingled to the eye : and doing jb, it 

 muft needs make a like appearance as the Sunnes beames do, 

 when reflecting from a black cloud , they fringe the edges of it 

 with red and with yellow ; and the like he doth, when he look- 

 eth through a rainyorawindycloiade : and much like hereun- 

 to, we fhall fee this mixture of ftrong white with a faint /had- 

 dow of black, make at this brim of the paper., a faire ledge of 

 red ; which will end and vanifh, in a merelightfomconeof 

 yellow. 



But at the hither edge of the paper, wfaere the fecondary 

 weake picture of white is mingled with the ftrong black picture, 

 in this mixture , t he blackc is prevalent, and accordingly (as 

 we faid of the mixture of the paintsrs colours ) there muft ap- 

 pcarcatthebottomeof die paper, a Lembe of deepeblew : 

 which will grow more and mre lightfomej, the higher it go- 

 eth : and fo, pafTmg through violet and leagreene it will vanish 

 in light, when itreacheth to the maftering field of primary 

 whitencfle,that iendeth his ftronger raves by direcl lines : and 

 this tranfpofaion of the colours at the icverall ends of the paper 

 fheweth the reaibn why they appeare quite contrary, if you put 

 a black paper upon a whitecarpet. And therefore , we need not 

 add any thino particularly concerning that. 



And likewiie, out of this we may underftand, why the eo- 

 lours appeare quite contrary (that i, red where before btev? 

 appeared; and blew, where red) if wee lookc upon the fame 



Bb 3 object 



