( 5 6 > 
true Caufe of this extraordinary Phenomenon, than 
by attending to the minuteft Particulars and Circum- 
ftances thereof ; and if what I have done contributes 
thereunto, i fhall efteem it a fufficient Excufe for the 
Number and Particularity of my Notes. 
Observation L Tab. I. Fig. i. 
OB. zz, 1730, 6 h 30* P. M. There lay near the 
Horizon an extended duskilh Vapour reaching from 
N Wby N. to N E byE. The upper Edge was the 
Segment of a Circle, wliofe greateft Height from the 
Horizon was about 1 j° bearing nearly N by E. Ad- 
joining to this was a concentric Segment of a very light 
Azure, of a greenilh Call, ftrongly illuminated, a few 
Degrees in Breadth, and then dilated more and more 
till it became blended with an extenfive Brightnefs, or 
Aurora, which lay every where above it for about 45* 
Degrees. There was in .feveral Places a faint Caft of 
Red. The Heavens were every where eiie perfectly 
ferene j a fmall Wefterly Wind, and the Moon above 
8o° below the Eaftern Horizon. 
Observation II. 6& 35'. 
Two Stria; riling perpendicularly from different Parts 
of the illuminated Edge of the Vapour (which I all 
along fuppofe to continue its Figure, when there is no 
particular Note to the contrary) Thefe were of a faint 
Red, and to the Height of 45* at leaft. 
Observation III. 6 h 40'. 
The Stria were very numerous to the Left, each 
about 4J° ; and one in the Middle (by which I fhall 
always 
