'( 70 ^ ) 
V. ExtraB of a Letter of Mr. Edw. Berkeley from 
Naples, federal curious Ohjer^ations and 
^marks on the Eruptions of Fire and Smoakjfrom 
Mount V E S'U V I O. Communicated by 
Dr. John Arbuchnot, M. D, and R. S. S. 
A pril 17 . 17 » 7. with much Difficulty I reach’d 
the top of Mount Pefuvius, m which 1 faw a 
vaft Aperture full of ^moak. which hinder’d 
the feeing its Depth and Figure. 1 heard within that 
horrid QuU certain odd Sounds, which feem’d to pro- 
ceed from the Belly of the Mountain ; a fort of Mur- 
muring, Sighing, Throbbing, Churning, DaOiing ( as 
ic were) of Waves, and between whiles a Noife like 
that of Thunder or Cannon, which was conftantly at- 
tended with a Clattering, like that of Tiles falling from 
the Tops of Houles on the Streets. Sometimes, as the 
Wind changed, the Smoak grew thinner, difeovering a 
very ruddy Hame, and the Jaws of the Pan or Crater, 
freak’d with Bed, and feveral Shades of Yellow. After 
an HouiV day. the Smoak, being moved by the Wind, 
gave us fhort and partial Profpeds of the great Hollow, 
in the flat Bottom of which i could dilcern two Fur- 
naces almofl contiguous ; that on the Left, Teeming a- 
bout three Yards in Diameter, glow’d with red Flame, 
and tlirew up red-hot Stones with a hideous Noife, 
which, as they fell back, caus’d the fore mentioned 
Clattering. May S. in the Morning, 1 afeeoded 
to the Top of Fefuvius a (ecood time, and found a dif- 
ferent face of things. The Smoak afeending upright, 
gave 
