( H} ) 
dominant, that I could not diftinguifli either the yellow 
or the blue : Still lower was -an Arch of purple, like 
the former, highly faturate with red, under which I 
cou’d not diflinguifli any more Colours. 
^ I bad the Pleafure of viewing this delightful Objed 
for a conliderable time, without that vaniihing. and re- 
turning of Colours which 1 defcrib’d in my laft. 
The Order of the Colours irrthis compounded Rain- 
bow was, you fee, red, yellow, green, blue, a Mix- 
ture of purple and red, green, (or rather a Mixture of 
yellow, green, and blue) a Mixture of purple and red. 
I begin now to imagine, that the Rainbow feldom ap- 
pears very lively without fomething of this Nature, 
and that the fuppos’d exad Agreement between the Co- 
lours of the Rainbow and thofe of the Prifm, is the rea- 
fon that it has been fo little obferv’d. 
Tetworth^ March x"], 
ly'L'L. 
I Am afraid I (hall tire you with the Hiftory of this 
Phaenomenon ^ but I have feen it in fuch Perfedion 
lince the writing my laft, that I cannot help being, 
particular in my Account of it. 
j^uguji 21% about half an hour pad 5 in the- 
Evening, Weather temperate. Wind at N. E. the Ap- 
pearance was as follows j viz. 
The Colours of the Primary Rainbow were as ufual, 
only the purple very much inclining to red, and well 
defin’d : Under this was an Arch of green, the upper part 
of which inclin’d to a bright yellow, the lower to a more* 
dulky green : Under this were alternately two Arches of 
reddilh purple and two of green: Under all a faint Ap- 
pearance of another Arch of purple, which vaniih’d 
