[ *93 ] 
L A Defcriptlon of an extraordinary Rain- 
bow obferved Tilly ic, 1748. by Peter 
Daval, Efa Sec . R. S. 
Read oa. 26, y y P o N Monday the 1 8th of July 
1748. about a Quarter before Seven 
in the Evening, the Weather being temperate, and 
the Wind about N. N. W. as I was walking in the 
Fields, beyond Iflington, 1 faw a diftant Rainbow 
which appeared to take in a large Portion of the 
Heavens ; but had nothing remarkable, and vanifh’d 
by degrees. 
Continuing my Walk, about twenty Minutes after 
the Difappcaring of the firft Rainbow, a rainy Cloud 
crofs’d me, moving gently with the Wind, which 
exhibited to me a more perfect and diftinft Rainbow, 
chan I had ever before fe.cn wherein I could plainly 
diftinguifh all the fecondary Orders of Colours taken 
Notice of by the late Dr. Lang r juith in his Letters to 
Dr. Jurtn publifhed inthePhilofophicaiTranfa&ions*, 
that is, to fay, within the Purple of the common 
Rainbow, there were Arches of the following 
Colours. 
1. Yellowifh Green, darker Green, Purple, 
2. Green, Purple. 
3. Green Purple. 
*Vld. Phil. Tranf. N°. 375. from Page 241 to 245. Ab, Tranf. 
(Eames and Martin) Vol. 6. p. 122, 123. 
B b This 
