lO TRAVELS THROUGH 



25. Red arfenic, or arfenic mixed with fulphur, 

 in the inner funnel of Vefuvius ; fcarce , either un- 

 determined or cryftallized flicking to lava. 



26. Green vitriol, coagulating likewife in the 

 inner funnel ; expofed to the air diflblving into an 

 humidity, which by iron-ocher is tinged brownifh- 

 yellow, and fells by the lava-dealers at Naples un- 

 der the name of oil. But thefe people, as well as 

 many Authors who have defcribed Vefuvius, are 

 of opinion, that there are in the bowels of Vefuvius 

 large quantities of inflammable materials ; fuch as 

 afphalt, naphta, and petroleum. I do not know 

 whether it be fo or not ; but I know very well, 

 that thefe materials are neither found on Vefuvius 

 nor thrown out by its eruptions. P. Torre, in his 

 Hiftoire des Phenomenes du Fefave, p. 232. fays : 

 " On voit fur la furface de la mer pres de Grana- 

 " tetto du petrole, qui fort des rochers-," but I 

 have not feen that place, and doubt whether it 

 have any connection with Vefuvius, having been 

 told that thefe rdcks are calcareous ; which, in 

 many other unvolcanic countries, fweat and pro-^ 

 duce petroleum and afphahum. The old Italian 

 Hiftorians of Vefuvius call even lava biiume. 

 which probably may have fsduced many modern 

 Ones into the lame error. Combuftible materials, 

 as fulphur, cannot be denied as exifting in Vefu- 

 vius ) but I never found any thing like afphaltum. 



27. Sal- 



