[ 6i 7 ] 
mod extenfive earthquakes fhould take their Fife from 
thence : the great earthquake of Lifbon has been 
* fhewn to have done fo ; and that the caufe of it was 
alfo at a greater depth, than that of many others, ap- 
pears from the greater -f* velocity with which it was 
propagated. 
75>. The great earthquake that deftroyed Lima 
and Callao in 1746, feems alfo to have come from 
the fea ; for feveral of the ports upon the coaft were 
overwhelmed by a great wave, which did not arrive till 
four or five minutes after the earthquake began, and 
which was preceded by a J retreat of the waters, as 
well as that at Lifbon. Againfi: this, it may, perhaps, 
be alleged, that there were four || volcanos broke out 
fuddenly, in the neighbouring mountains, when this 
earthquake happened, and that the fires of thefe 
might be the occafion of it. This however, I think, 
is not very probable 3 for, to omit the argument of 
the wave, and previous retreat of the waters, already 
mentioned, it is not very likely, that more than one 
fire was concerned : befides, the vapour, opening it- 
felf a paflage at thefe places, could not well be fup- 
pofed, if it took its rife from thence, to fpread itfelf 
far 5 efpecially towards the fea, where it is manifeft. 
* See art. 54. See alfo art. 94 to 97 inclufive, 
+. See the note to art. 63.. 
% Both the wave and previous retreat have been obferved in the 
other great earthquakes, which have happened at Lima, and in the 
neighbouring country. See d’Ulloa’s Voyage to Petu, part ii. 
book i. chap. 7. 
|| If thefe volcanos were not new ones, but only < 51 d ones which 
broke out afrelh, [See the note to art, 34. ] the argument will come 
with kill greater force, 
that 
