( ) 
Let AB rcprefent a Drop of Rain, B the Point from 
whence the Rays of any determinate Species being 
refled:ed to C, and afterwards emerging in the Line 
CD, do proceed to the Eye, and caufe the Appearance 
of that Colour in the Rainbow, which appertains to 
this Species. It is oblerved by Sir Jfaac Newton % 
that in the ReflecStion of Light, beiides what is re- 
flected regularly, fome finall part of it is irregularly 
fcattered every way. So that from the Point B, be- 
frdes the Rays that are regularly reflected fromB to C, 
Ibme fcattered Rays will return in other Lines, as in 
B E, B F, B G, B H, on each Side the Line B C. Fur- 
ther it mufl;. be noted from Sir Ifaac Newton that 
the Rays of Light in their Paflage from one Superficies 
of a refracting Medium to the other undergo alternate 
* Optics, Book II. Part 4. ^ Ibid. Part III. Prop. xi/. 
Fits 
