[ 5 ° 1 
VL An Account of feme Scoria from Iron Works , which refembk 
the vitrified Filaments deferibed by Sir Wiliam Hamilton. In 
a Letter from Samuel More, Efq. to Sir Jofeph Banks, Bart ... 
P. R. S\ 
Read January 17, 17S1. 
SIR,. 
I N the very accurate account given of the eruption of Mount? 
Vefuvius in the month of Auguft, 1779, in a letter from Sir 
william HAMILTON, printed in the Philofophical Tranfac- 
tions, vol. LXX. part I. p. 42. et feq. among many other 
equally curious informations,, it is faid, “ Long Filaments of 
“ vitrified matter, like fpun-glafs, were mixed with and fell 
with the afhes.” And in a note annexed it is alfo faid, that 
“ during an eruption of the volcano in the Ifle of Bourbon in 
“ 1766, fame miles-' of country, at the diitance of fix leagues 
“ from the volcano, were covered, with a flexible capillary yel- 
“ low glafs, fome of which were two or three feet long, with 
“ fmall vitrous globules-at a little diftanceone from the other.” 
There appeared to me 011 reading thefe paflages an exact 
iimilarity between thefe productions of the two volcanos and. 
fome fcoria I had received from a worthy friend, who is matter 
of one of the largeft works in England for fmelting iron. In 
a letter accompanying the fpecimen, he writes, “ I have fent 
“ a fpecimen of fome flag, or vitrified cinder, which has. by 
o “ the 
