ioz Mr. tunst ali/s Account of fever al Lunar Iris. 
my troubling you with this, was on Friday the 1 8th indant, 
perhaps the mod extraordinary one of the kind ever feen, and 
of which I was myfelf a Ipedtator for mod of its duration, 
as were many in my houle and neighbourhood. It was fird 
vilible about nine o’clock, and continued, though with very 
different degrees of brilliancy, till pad two. At fil'd, though 
a drongly marked bow, it was without colours ; but afterwards 
they were very conlpicuous and vivid in the fame form as in the 
lolar, though fainter ; the red, green, and purple, were mod 
didinguifhable. About twelve it was the mod fplendid in ap- 
pearance ; its arc was confiderably a fmaller fegment of a circle 
than a folar ; its fouth-ead limb fird began to fail, and a confi- 
derable time before its final extin&ion ; the wind was very 
high, nearly due wed, mod part of the time, accompanied 
with a drizzling raim It is a lingular circumdance, that three 
of thefe phenomena fhould have been feen in fo fhort a time in 
one place, as they have been edeemed ever fince the time of 
Aristotle, who is laid to have been the fird obferver of 
them, and faw only two in fifty years, and fince by plot and 
thoresby, almod the only two Englifh authors who have 
fpoke of them, to be exceeding rare. They.&em evidently to 
be occafioned by a refra&ion in a cloud or turbid atmofphere, 
and in general indications of fiormy and rainy weather, fo bad 
a feafon as the late dimmer having, l believe, feldom occurred 
in England, tiioresby, indeed, fays, the one he obferved 
was fucceeded by feveral days of fine ferene weather. 
One particular, rather fingular, in the fecond, viz. of 
July the 30th, was its being fix days after the full of 
the moon, and the lafi, though of fo long a duration, was 
three days before the full; that of the 27th of February was 
exafUy 
