* 



ST. VINCENT, AND TEXERIFFE. 



145 



Upper 

 Gailert. 



133. — Highly crystalline roRPiiYMTic greenstone, com- 

 posed of crystals of glassy felspar and hornblende. 



134 & 135. — Highly crystalline torphyritic green- ,y,Yall-case J • 

 stone (another variety), with olivine and included frag- 

 ments of scoriaceous lava ; the augite has under one par- 

 tial fusion. 



136. 



Fine-grained torpiiyritic 



variety), with decomposing olivine. 



greenstone (another 



13* 



t 



Jaspideous rock. 



138. — Napoleonite, or orbicular greenstone, * from 



Corsica. It is composed of- 



Felspar (Anorthite) - 

 Hornblende 



90*00 

 10 '00 



100*00 



139. — Scoriaceous lava, assuming a stalactitic form in 



cooling, and containing, on one side, entangled fragments of 

 a dark scoriaceous lava. Etna : from a bocca, or the ca- 

 vernous opening, where a lava stream first commences to 

 flow out at the side of a volcano. 

 Presented by W. W. Smyth, F.G.S. 





Volcanic products from the Peak of Tcneriffe. 



Presented by Professor C. Piazzi Smyth, F.R.S. 



Teneriffe.— The igland of Teneriffe, off the west coast of 

 Africa, is the largest of the Canary Islands, being 36 miles 

 Jong, with an area of 1,000 square miles. The Peak is 

 situated at its N.E. end, and rises to a height of 12,158 feet 

 above the level of the sea. The upper portion is a rugged 

 conical eminence, 852 feet high, difficult of ascent on ac- 

 count of the loose ashes by which it is covered, and so 

 narrow on the top as scarcely to afford standing room. A 

 steep wall on the summit would prevent access to the crater, 



* See also No. 275, Case 6. p. 255. 



