Permajmit Colours of Op ah Bodies. r$i 



bodies refle£fing the more refrangible, others the 

 lefs refrangible rays, more copioufly. And that 

 *' this is not only a true reafon of thefe colours, 

 but even the only reafon."* 



He conceived that opake bodies refled the co- 

 loured light from their anterior furface, by fome 

 power of the body evenly diffufed all over its fur- 

 face, and external to it. 



He thus delivers his dodlrine relative to tranf^ 

 ^parent coloured liquors'f " A tranfparent body 

 " which looks of any colour by tranfmitted light, 

 *' may alfo look of the fame colour by refle<fled 

 *' light, the light of that colour being reflefled 

 " by the farther furface of the body, or by the 

 air beyond it. And then the reflefted colour 

 will be diminifhed, and perhaps ceafe, by 

 making the body very thick, and pitching ic 

 " on the back fide to diminifli the refledtion of 

 " its farther furface, fo that the light refleded 

 " from the tinging particles may predominate. 

 *' In fuch cafes, the colour of the reflefled light 

 " will be apt to vary from that of the light 

 " tranfmitted." 



As thefe opinions are merely hypothetical, and 

 are not fupported by the evidence of any experi- 

 ments, I judged it expedient carefully to inquire 

 into the phenomena of Coloured Subftances, 



• lb. L. I. Par. II. Prop. X. Probl. V. 

 t lb- 

 Vol. II. M from 



(C 

 (C 

 (C 



