:252 Human Frame* 



surfaces are polished ; whereby they, re- 

 flecting the rays in the same order as they 

 come from other bodies, shew us their 

 images. 



The rays that are reflected from opaque 

 bodies always bring with them to the eye 

 the idea of colour; and this colour is 

 nothing else in the bodies, but a disposi- 

 tion to reflect to the eye more copiously 

 one sort of rays than another. For par- 

 ticular rays are originally endowed with 

 particular colours ; some are red, others 

 blue, others yellow, and others green, &c. 



Every ray of light, as it comes from 

 the sun, seems a bundle of all these seve- 

 ral sorts of rays ; and as some of them 

 are more refrangible than others ; that 

 is, are more turned out of their course, 

 in passing from one medium to another, 

 it follows, that after such refraction they 

 will be separated, and their distinct co- 

 lour observed. Of these, the most re- 

 frangible are violet, and the least red ; 

 and the intermediate ones, in order, are 

 indigo, blue, green, yellow, and orange. 

 This separation is very entertaining, and 

 will be observed with pleasure in hold- 

 ing a prism in the beams of the sun. 



