Tree BU Riss E}D-HIL i aka 
Id 
It appears that this covering of mould has been laid upon 
the lava by inundations of the river. The mouldered part 
of the ftream of lava is, in-many places, ploughed up, and 
feems to moulder and crumble away much fafter when 
thus expofed to the air. ; : 
The lava has iron in its compofition, and when pul- 
verized is.attraCted by the magnet; and wherever a peb- 
ble-ftone is flruck out from it, there remains a cavity, 
greatly refembling acaft iron veflel: fo that this congeal- 
ed matter muft have fuftained a great degree of fire te 
keep itin a flate- of liquefaction, boiling and running 
‘over the top of the volcano, in a ftream of liquid fire, for 
halfa mile, on the level ground, before it congealed. 
After fubjeQing it to the magnet, as mentioned above, we 
{ubmitted it tothe crucible, where it melted and ran as we 
are told the lava of A‘tna does. 
Farther remarks: extratted from a letter from Dr. 
Greenway to Dr. Barron. 
Read May, HE gentleman who examined this extin« 
Bs lakes guifhed volcano, and furnifhed me with his 
defcription of it, has fince brought mea piece of the lava, 
of which, he fays, there are coagulated maffes, on the 
* fummit of the hill, that will weigh a thoufand or fifteen 
hundred pounds. It is compofed of earth, common peb- 
ble-ftones, fome metallic fubftance, particularly iron at~ 
tracted by the magnet; and the whole melts intoa confu- 
fed liquid mafs in a crucible placed in the heat of a com- 
mon fmith’s furnace. | | 
VOL. IL. G g N°’, XXIX. 
