c: 47 X: 
Velay, wKidi I propofe myfelf the honour of prefenting = 
to the Society upon a future occafion. In the mean time " 
Ijam, with great refpe6t and eflieem, sir, 
. Your mod: obedient 
and very humble fervant, 
JOHN STRANGE.- 
P'. S. Since the termination of the foregoing paper, I 
am informed by Mr. Charles hay, of Brecknock, in ‘ 
South Wales, that the prifmatic bafaltine columns of ' 
Towen before mentioned were a6tually brought from- 
Cader Idris, at the top of which mountain there are pro- ’ 
digious quantities of them, which are totally different ^ 
from the rocks around them. This information Mr. hay ' 
has lately received- from a perfon informed ; having ’ 
obligingly made the inquiry at my requeft. I may, per-' 
haps, be enabled hereafter, through the fame channel, i 
to tranfmit to the Society a more particular account of ■ 
thephaenomenon ; prefuming, that, infome part or other 
of Gader Idris, thefe columns form a regular gr.oup^ as -• 
they commonly do in -other places , • 
