262 



EXTINCT YOLCANOS 



Upper 

 Gallery, 



66. 



of glassy ft 



mica and fragments of augite.— From the mountain about a 



Table-case 



in Recess 6. mile from Viterbo. 



67. 



Ikachytic lava, with crystals of glassy felspar 

 mica and small specks of augite.— Near Baslanello 



east 



Monte 



68— Trachytic lava, with crystals of glassy felspar, 

 mica, and small fragments of augite.— From Bomargo east 



Monte 

 69. — Trachytic 



/^foj9 



Cimino. 



augitic fragments — Near Bagnaja, east of Monte 



70 — Decomposed earthy trachyte —San Leonardo 



near Fabbrica, east of Monte Cimino. ' 



7 , 1 .'~~ C ? M » P r ACT P0EPIIYRITIC Rock— Forming the upper 



della Cava Grande, at the alum works 



Monte 



near Tolfa. 



72. PORPHYBITIC ROCK, with 



felsp 



Forming the second stratum which alternates with the alum 



Monte 



73. — Siliceous and felspathic rock. Forming 



upper stratum at the Great Cavern, near Tolfa. 



r A # * m\ . -mm 



the 



74. 



Fogliano, above Vitralla. 



of glassy felspar.— -Monte 



75. 



76. 



2EOUS {approaching to pumiceous) la 

 iy felspar — From Civita Castellana. 



neighbourhood of Bracciano. 



felspar. — From the 



77. — Lava, with 



sy felsp 



Grotti, near Bassano nella Teverone. 



& 



•From Capo le 



78. 

 augite. 



79 



'syfelspa 



Monte 



iy felspar 



and augite, forming a columnar mass with a rhombic base. 



•Near 

 80. 



/< 



•From Capo di Bove, near Rome. 





)P 



u 



V 



rf 



