[ M ] 
XXXVI. An Account of an inverted Iris, ob - 
ferved on the Grafs in September, and an- 
other in G<°;ober, 1751, by Philip Carteret 
Webb Ef r , F. R. S. 
Read O£tob 24. the 24. September 1751, about 
ten in the morning, I obferved a 
folar iris on a grafs lawn, near my houfe, at Buf- 
bridge in Surry. The morning was fair and clear, 
and the grafs of the lawn was the night before almofi 
cover’d with webs refembling thole of fpiders, which 
many perfons efieem the forerunners of fair weather; 
and there had fallen in the night a large dew, with 
which the webs and the grafs were thoroughly 
wetted. 
The arch or bow appeared inverted, the point A 
being diftant about 24 inches from the point of my 
foot ; and where-ever I moved on the lawn, it feemed 
to move at that diftance before me. The lawn, on 
which I obferved this appearance, is a hanging level, 
which drops about 6 feet in 100 from A towards E . 
It extended itfelf to the end of the lawn, the grafs 
of which was fhort, and it was not vifible on the fur- 
fdce of the adjoining water, or grafs fields. 
It was about two feet wide, and the colours were 
vivid and difiinCt. 
Not having feen any thing of this kind before, nor 
recollecting to have read a defcription of an iris of 
this fort, I upon the fpot took the dimenfions of it 
exprelfed in the annexed Fig. 1. in which the difiance 
from 
A 
