520 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Feb. 2 



Fig. 6. — Ideal section of a simple Volcanic Cone, formed by the accu- 

 mulation of erupted fragmentary matters from a single vent. 



• ir«.Jllj ''Kiia.*^' ••■■'>'** 



^ig. 7. — Natural Cliff-section of a simple Cone of Eruption : the 

 Capo di Miseno, near Naples. 



Fig. 8. — Graham Island, as it appeared in September 1831. 



