20 On Volcanos and Earthquakes. 
agitation in one moment, is such a prodigy, as we would never 
believe, did we not know, it to be a fact, from our own senses.’ 
The astonishment of the writer of this peragree® would 
have ceased, if he had conceived, as ourselves, t at the va- 
cuum Se T, in a receiver is almost instantaneous in all 
its parts, whatever be its extent, or is filled as instantaneous- 
ly, because steam and gases rush into a vacuum at the rate 
of thirteen hundred and five feet in a second of time, under 
the pressure of one atmosphere: what then must it be under 
eight hundred? The following extracts will come again in 
support of this assertion. 
Accaat Be: an adtarshquake at Lisbon, Nov. Ist, ites _ Dr. melfal. 
Phil. Tr. vol. 4 a 
a “& Soon Sater, the shock, (forty wane past nine,) which "wa 
near high water, the tide rose forty feet t higher, in an “ete 
than was ever known, and as suddenly subsided.” 
The same at Oporto, in ister Nov. 1st, 1755. Phal. Tr. 
- It feyit about half an shea ae nine....and soon saw the r 
er in some places open, and throw out a vast deal of wind, which 
was very terrifying... 
The same at Cadiz, Nov. 1st, nebigt ee eee wees ar. 
vol. 4 
“Just before ten, the whole fea was shaken with a *vcient 
times, but with less force each time.” 
The some in Barbary, Nov. Ist t, 1755. General eee Governor 
e eg» of Gibraltar. Phil. Tr. vol. 4 
At Teta the earthquake began at ten in the morning... 
At Tangier, “ it began about the same time......the sea came e up 
‘to the very walls, a thing never seen before, and went down with 
the same rapidity." These commotions of the sea were repeated 
eighteen me es not with the same violence as at the first 
time...... The foun ains were dried up, so that there was no see 
to be had till night.” 4 ys 
At Arzila, «é it happened about the same time.” _ 
eS ih i 
Tae ar asl prt th ao ia dll 
RS Sah tip a Sah ad Peas 
