[ 5§i ] 
Sect. IIF. 
37. It may be afked, perhaps, why we fhould 
fuppofe, that feveral fubterraneous fires ex iff in the 
neighbourhood of volcanos ? In evidence of this, 
we have frequent inftances of new volcanos breaking 
out in the neighbourhood of old ones : Carguayrafo, 
juft mentioned, may fupply us with one example to 
this purpofe j and, in the night of the 28th of Octo- 
ber 1746, in which Lima and Callao were deffroyed, 
no lefs than four * new ones burft forth in the ad- 
jacent mountains. 
36. To the fame purpofe, we may allege the in- 
ftances of many volcanos lying together in the fame 
trad; of country : as for example, the many places, 
“ not fo few as forty,” amongft the Azores, which 
either do now or have formerly fent forth fmoke and 
flames ; the many volcanos alfo amongft the Andes, 
already mentioned : thus /Etna, Strombolo, and Ve- 
fuvius, I may add Solfatara too, are all in the fame 
neighbourhood : and Monf. Condamine fays, he has 
traced ^ lavas, exadly like thole of Vefuvius, all the 
way from Florence to Naples. In f Iceland alfo, we 
have, befides Hxcla, not only feveral other volcanos, 
but alfo a great number of places, that fend up ful- 
* See d’Ulloa’s Voyage to Peru, part ii. book i. chap. y. 
f See Phil. Tranf. vol. xlix. p. 624. All thefe lavas, as well 
as the volcanos juft mentioned, lie in a continued line. The fame 
thing holds good in the volcanos of the Andes alfo. This is a fadt 
I muft defire the reader to attend to, as it ferves to Confirm a very 
material dodlrine, which I (hall have occaiion to mention here- 
after. See art. 44, 45, and 46. 
+ See Horrebow’s Natural Hiftory of Iceland. 
4F 2 
phureous 
