. The art of landscape gardening. colours, red,yellow, blue; and let o, G, P represent the compounds orange,green, and purple ; it is evident that, to make a deeper orange,we must add more red; and to make a bluer green, we mustadd more blue ; and to make the purple redder, we must addmore red, and vice versa: but besides this, the diagram puts usin mind that G is the contrast to R, and that, therefore, thosetwo colours cannot be mixed without approaching to a dullwhiteness or greyness ; and the same may be said of Y and pand of B and o. These colours are also contrasts to each other; Notes 25
. The art of landscape gardening. colours, red,yellow, blue; and let o, G, P represent the compounds orange,green, and purple ; it is evident that, to make a deeper orange,we must add more red; and to make a bluer green, we mustadd more blue ; and to make the purple redder, we must addmore red, and vice versa: but besides this, the diagram puts usin mind that G is the contrast to R, and that, therefore, thosetwo colours cannot be mixed without approaching to a dullwhiteness or greyness ; and the same may be said of Y and pand of B and o. These colours are also contrasts to each other; Notes 251 by mixture they destroy each other, and produce a whiteness,or greyness, according as they are more or less perfect; butwhen kept distinct, they are found to make each other lookmore brilliant by being brought close together: and all this isagreeable to what is said in section 11, and in the note tosection 14. 22. Sir Isaac Newton observes that he had never been ableto produce a perfect white by the mixture of only two primary. Fig. 28. colours, and seems to doubt whether such a white can be com-pounded even of three. He tells us that one part of red leadand five parts of verdigris composed a dun colour, like thatof a mouse; but there is nothing in all this which militatesagamst the explanation here given of the cause of the colouredshadows of bodies ; for even supposing that there did not existin nature any two bodies of such colours as to form perfectwhiteness by their mixture, or, to go still further, supposingthat no two prismatic colours of the sun could form a com-pound perfectly white, still the facts and reasonings here statedrespecting the mixtures of such colours as are called contrastsare so near the truth that they furnish a satisfactory accountof the appearances of the colours of the shadows which wehave been considering. The terms by which we are accus-tomed to denominate colours have not a very accurate or precise 252 Notes meaning, and particularly those terms
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