( «3J ) 
obferv’d it feme time after, it lay between the Stars in 
Andromeda^ Right-hand, and thofe at the end of her 
Chain. The fame Obfervation was made by a Cu- 
rious Gentleman of this place, who alfo intbrm’d me 
that there was another luminous Arch w hich pad quite 
thro* the Pole Star : It*s continuance was fhort, and 
I had not the good fortune to fee it my felh 
Thefe Appearances held on in fome degree till a- 
bout II, when the Air began to grow mihy, and fo 
put an end to any farther Obfervacions. 
I cannot fend you the exadh Point of the Wind : It 
was fo calm below, that I cou d not be certain which 
way it flood; but fome that were making their Ob- 
fervations from a high open Place, aflur’d me, that it 
was North-weflerly, as it was in the Afternoon before, 
and the Morning after. 
The Mercury was up at 30: The Weather mild 
and temperate. 
1 am afraid this Letter is already tedious, and yet I 
(hall venture to lengthen it with the following Obferva- 
tions. * 
/ 
- 1. That It plainly appears from the Pofition of the 
Arches, that they cou’d not ow e their Figures to the 
Sun : They feem to have been partly Optical, and 
partly to have depended upon the different Heights 
ot the luminous Vapours; but for want of fufficient 
Data^ it will be no eafy matter to determine how far 
each of thefe Caufes concuri*d. 
2. The Prifmatick Colours, wherever they ap- 
pear’d, feem to have been caus’d by the Sun. 
3. None ot the Streams, as tar as I could obferve, 
proceeded dir edlly from the Horizon. They were near- 
ed it towards the North, where there were fome weak 
irregular Lights in the confus’d parts of the Arch be- 
fore deferib’d S % ^ 4. I 
