Petralogy, Vol. 2

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Excerpt from Petralogy, Vol. 2: A Treatise on RocksIt is.unnecessaly towarn the readerthat this extract is not fiom the hand of theexcellent author, and that of course it is only the general ctm'cnt of the ideas which deserves atten tion. But as the Germans have too much restricted, or rather annihilated, the in¿uence of volcanoes, it seems here to be rather too much enlarged: for if we suppose two hun dred existing volcanoes, and compute the medium of their agency at thirty miles each, the amount will be six thousand square mile, or at the most equal to the island of Sicily.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.