H4 Miftettanea Cur to fa. 



ted y or thar, together with the red, the neigh- 

 bouring Colours, into which any red is fecretly 

 difperfed, (that is, the yellow, and perhaps green 

 too) be intercepted \ or elfe, that allowance be 

 made for the emerging of fo much red out of the 

 yellow green, as may pofllbly have been diffufed, 

 and fcatteringly blended in thofe Colours. And 

 if thefe things be obferved, the new Produ* 

 £tion of red, or any intercepted Colour, will be 

 found impoffible. 



This, I conceive, is enough for an Introducti- 

 on to Experiments of this kind ; which if any of 

 the Bjyal Society (hall be fo curious as to profe- 

 cute, I mould be very glad to be informed with 

 wliat fuccels : That, if any thing feem to be de- 

 fective, or to thwart this Relation, I may have 

 an opportunity of giving farther Direction about 

 it, or of acknowledging my Errors, if I have 

 committed any. 



Since the Publication of this Theory, fome Mifunder- 

 fiandings happening between a French Philofopher 

 at Paris and Mr. Newton, he has endeavour d 

 to explain himfelf a little further in thefe 'Things 9 

 according to the following Method* 



DEFINITIONS. 



i. I call that Light Homogeneal, Similar, or 

 Uniform, whole Rays are equally refrangible. 



x. And that Heterogeneal, whofe Rays are 

 unequally refrangible. 



Note, There are but three Affections of Light 

 in which I have obferv'd its Rays to differ ; 0%. 

 Refrangibility,Reflexibility, and Colour $ and thote 

 Rays which agree in Refrangibility, agree al/b 



