258 



EXTINCT VOLCANOS 



Upper 

 Gallery, 



H- — Tufa, composed of decomposing glassy felspar, small 



Table-case fra g ments of 9 Te V lava > augite, and specks of silvery mica. — 

 in Recess 6. From the basin of Lake Baccano, on the road to Monte 



Rossi. 



12. — Brown cellular tufa, some of the cells filled with 



yellow pumiceous remains, with earthy leucite, augite, a little 



mica. &c. 



■Monte 



13. — Compact tufa, with earthy leucite, fragments of 

 pumice, mica, and augite. — From the Olive Grove of Valdo 

 Ambrini. 



14. — Brick-red tufa, with fragments of lava, pumice, 



earthy leucite, augite, mica, and metamorphic marble. 

 From Monte Verdi, 2 miles from Rome. 



15. — Spongy tufa, full of yellow pumice, partly stained 



felsp 



•From 



the basin of the ancient lake Baccano, on the road to Monte 

 Rossi. 



16. — Brown tufa, with earthy leucite and fragments of 

 brown lava, augite, &c. — From the summit of the Quirinal, 

 5 feet below the roadway in front of the Palazzo della 

 Consulta, Rome. 



17. — Granular tufa, composed of pieces of pumice, 



augite, and leucite, overlying No. 12. — Monte Pincio, inside 

 Rome. 



18. — Reddish-brown tufa, with fragments of grey lava, 

 mica, and much earthy leucite. — From the summit of the 



* 



Quirinal, inside Rome. 



19. — Grey tufa, with leucite, &c. — Near the gate of 

 Santo Spirito, inside Rome. 



■ 



20. — Stony tufa, composed of pieces of lava, pumice, 



and ashes, with augite, mica, and earthy leucite. — From the 

 Vatican at Rome, found in 1818 in digging the foundations 

 of the Chiaramonti Museum. 



21. — Tufa, with included fragments of pumiceous lava, 

 with earthy leucite, crystals of glassy felspar, &c, occur- 

 ring at the surface near the first gate beyond Tor Di 

 Quinto. 



P 



5 



¥ 



t 



p 



fro" 1 

 1i 



V 



li 



f 



I"- 



t»!s o: 



j§< 



w 



mt 



I mile 



81, 



dm 



ItAri 



32. 



( 



from 



34, 



4, ft 





* 



