Geological Observations of Volcanic Islands

Book Excerpt: in calling attention to phenomena and considerations that had been quite overlooked by geologists, but have since exercised an important influence in moulding geological speculation; and lastly in showing the importance which attaches to small and seemingly insignificant causes, some of which afford a key to the explanation of very curious geological problems.Visiting as he did the districts in which Von Buch and others had found what they thought to be evidence of the truth o...