270 



Uppeb 

 Gallery. 



Table-case 

 in Recess 6. 



EXTINCT VOLCANOS, ETC. 



199. — Selenite. — From the Great Altar, near Tolfa. 

 200. — White gypsum {alabaster). — Tolfa. 

 201.— Aragonite. — Monte Cappuccini, near Orta. 

 202. — Bole. — Found in crevices of tufa near the church 

 of San Lorenzo, outside the walls of Rome. 



/ 



203. — Bole. — Found in a large hollow in decomposed 

 peperino, outside the Porto San Giovanni, four miles from 



Rome. 



204. — Bole — Found in crevices of the basaltic lava 



stream of Capo di Bove. 



205. — Fine Clay. — Found in the veins of alum rock in 



the Great Cavern. 



206. — Travertine. — From the lake near Tivoli. 



207. — Calcareous Tufa (stinkstone). — Travertine from 

 Lake Tartarus, below Tivoli. 



208. — Travertine, deposit of carbonate of lime with 



spherical cavities produced by the escape of carbonic acid 



gas. — From the spring near the lake of the floating island 



below Tivoli. 



209. — Travertine, calcareous deposit inclosing the shells 

 of snails. — Occurring in the volcanic tufa at the descent 



from Porto Solaro, 2 miles from Rome. 



: 210. — Travertine (" Tivoli travertine"). — Calcareous 



deposit from the neighbourhood of the lake of the floating 



island below Tivoli. 



211. — Limestone, with a portion of a univalve shell. 



Monte Mario, near Rome. 



212. — Limestone, enclosing a fossil bivalve shell. — Monte 

 Mario. 



213 and 214. — Metamorphic limestone. — From the 

 Apennine chain of the Roman States. 



215. — Stalactitic carbonate of lime. — From the grotto 

 of Collepardo, on Monte Ernici, in the Campagna. 



216. — Stalactitic carbonate of lime. — From the Cas- 



* 



cade below the temple of the Sibyl, at Tivoli. 



217 



Stalactitic carbonate of lime. — From Subiaco, 



in the Campagna. 



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