Untersuchungen über die Mikroskopische Zusammensetzung und Structur der Basalt-Gesteine Mikromineralogische Mittheilungen Beiträge zur Petrographie der plutonischen Gesteine Sur les Crystallites, études crystallogeniques Kritische Mikroskopisch-mineralogische Studien Mikroskopische Unterscheidung der Mineralien aus der Augit, Amphibole und Biotit-gruppe

Abstract

II. AMONG the Continental petrographers who have led the way in the recent reform and extension of this branch of science, none can claim a more prominent place than Dr. Zirkel. Although still a young man, he has held professorships successively at Lemberg and at Kiel, and we rejoice to hear from him that he has been selected to succeed the venerable Dr. Naumann at Leipzig. He is the author of many excellent mineralogical and petro-graphical papers, and of the best text-book of petrography which has yet been published. Especially has he distinguished himself by the zeal with which he has followed out the ideas first broadly sketched by Mr. Sorby, and has shown how absolutely indispensable is the application of the microscope to the study of the composition and history of rocks. His researches, while extending over the length and breadth of Germany, have not been confined to the Continent, but have been carried with characteristic enthusiasm even as far as the peaks of Arran, and the cliffs and glens of our north-western isles. Untersuchungen über die Mikroskopische Zusammensetzung und Structur der Basalt-Gesteine. Von Dr. F. Zirkel. (Bonn, 1870.) Mikromineralogische Mittheilungen. Von Dr. F. Zirkel. Pp. 801. (Neuses Jahrbuch für, Mineralogie, 1870.) Beiträge zur Petrographie der plutonischen Gesteine. Von Justus Roth. (Reprinted from the Transactions of the Royal Academy of Sciences of Berlin.) Sur les Crystallites, études crystallogeniques. Par H. Vogelsang. (Archives Néerlandaises, 1870.) Kritische Mikroskopisch-mineralogische Studien. Von H. Fischer. (Freiburg.) Mikroskopische Unterscheidung der Mineralien aus der Augit, Amphibole und Biotit-gruppe. Von G. Tschermak. (Proceedings of the Vienna Academy of Sciences, 1869.)