( 111 ) 
white Tail, much narrower than the Mock-Sun, but 
which I took to be a Segment of the white Circle which 
I once faw entire in London, Had the Air been clear, 
] doubt not but much more of the Phenomena of the 
Parhelia might this Time have been obferved : 3nd I 
hope, that from our Neighbourhood fome Member of 
the Society may furnifh us with a fuller Relation. But 
how to explain thefe Appearances, and account for 
the Magnitude of thefe Circles, is what feems ftill 
wanting. 
III. An Account of two Mock-Suns, and an Arc 
of a Rainbow inverted, ivith an Halo, and 
its brighteft Arc , feen on Sunday and Monday, 
O&ob. 22 , & 23. \7ii. at Lyndon, Comitat* 
Rutland, communicated by the tfev. Mr. William 
Whifton, M. A. fomtime Trofeffor of the Ma- 
thematicks in the UmVerfity of Cambridge. 
A BOUT Ten o’clock in the Morning, on Sunday, 
OBob . 22. 1721. being at the Houfe of Samuel 
Barker , Efq:, of Lyndon in the County of Rutland, after 
an Aurora Borealis the Night before (Wind W. S. W.) 
I faw an Attempt towards two Mock-Suns , as I had 
done fometimes formerly, of which I immediately in- 
form’d Mr. Barker , though without any great Expe&a- 
tions of what followed. About i or i of an Hour af- 
ter, I went to view the Heavens, and then found the 
Appearance compleat ^ and when Mr. Barker and 0- 
thers of the Family were call’d, we all faw it, and all 
