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Excerpt from Mineralogische und Petrographische Mitteilungen, Vol. 2 In einer ausgeze1chneten Arbeit ber die l ngs des vierzigsten Breitegrades in nordwest-amerika vorkommenden Gesteine hat Zirkel das fr her von v. Richthofen prepylit genannte Ge stein n her definirt und f r dasselbe eine Reihe von Charakteren aufgefunden, welche ihm erlaubten, dasselbe von den Hornblende Andesiten, zu denen es bisher gerechnet werden, zu trennen; durch die Beobachtungen von Clarence King') wurde diese Trennung beider Gesteine auch in geologischer Hinsicht durchgef hrt. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This 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.

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