( 180 ) 
its Tranfparency : To remedy which, I found it ne- 
ceffary to prolong that Side of the Cap that was 
before the Eyes, and thereby enlarged the ProfpeCf 
of what was under us. 
V. An Account of an Aurora Borealis, obferved 
at Dublin, on Monday the Jixtb of February, 
1720-1, Sy J. W. 
T H E Royal Society having done me an unex- 
pected Honour, in caufing a fhort Account, 
which I fent ’em of the Aurora Boreales , that were 
feen the 10th and 24th of November, in the Year 
1719, to be printed in their Journals ^ I now prefent 
them with an ExtraCl of what was oblerved on Mon- 
day the 6th of February laid. The Air was all that 
Day, as it had been for fome time before, very clear 
and fharp ^ about half an Hour part four in the Eve- 
ning, fome flying Clouds appear’d, and the Sky was 
ting’d with a very unufual yellowifh Colour, which 
perhaps might be reflected from a great Quantity of 
Snow, that foon after fell for near a quarter of an 
Hour. However that might be, l*m willing to date 
the beginning of the enfuing Bhanomena from the 
firft appearance of this uncommon Light. About a 
quarter pall fix, a thin Vapour, which was as yet 
very ill defin’d, and in all appearance refembl’d an 
exceeding black Cloud, had fix’d it felf in the Nor- 
thern Hemijphere j its Edges were ting’d with a red- 
difh Yellow, that by degrees, as it approach’d the 
Vertex, 
V 
