284 TRAYELS THROUGH 



Somewhat higher in the valley, but on the fame' 

 floping fide of the hill, is another funnel of 

 burning petroleum. It is of a larger circumfe- 

 rence, but the flames fo faint/ that they are fcarce 

 vifible by day-lighr. Farther on, at the end of the 

 valley, where the ground afcends to the higheft 

 fummit, is a fmall pool, called Aqua Euja ; 

 whofe water, though cold, feems for ever boiling, 

 on account of many air-bubbles which rife from 

 its bottom. Its furface is covered with bitumi- 

 nous oil, which catches the fire of any approach- 

 ing candle or flambeaux, and continues burning 

 till wind or rain quench its flames. All thefe curi- 

 ofities are within a circumference of about one 

 Italian mile and a half. The higheft fummit of 

 the Apennines, which I mentioned before, confifts 

 of reddifh limeftone beds, covered by large ftrata 

 of a coarfe grey limeftone, and dipping as com- 



monlv in twenty-five degrees. 



,. yjctopj 



This coarfe grey limeftone continued and alter- 

 nated with marl-flate till I came to Dcjano, at the 

 diftance of fix miles, where appeared ferruminated 

 or glued beds of blunted quartz-pebbles and 

 detached lime-fand, and argillaceous flate pieces/ 

 Superincumbent to thefe 1 found firft marl-flate, 



flone's being a volcanic production, I have, however, no- 

 ticed this obfervation, fince no phenomenon in nature feems' 

 to me indifferent. 



and 



