Modern Petrography An Account of the Application of the Microscope to the Study
Modern Petrography An Account of the Application of the Microscope to the Study
George Huntington Williams
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Any notice, however brief, of the origin and progress of modern petrography would be very incomplete without a * Neues Jahrbuch fur Mineralogie, etc. , 1883, II. , p. 87. T Memoires de 1'Institut de France, XII. , No. N. \ Neues Jahrbuch fur Mineralogie, etc. , 1881, 1. , p. 172; ibid. , II Beilage Band, p. 620. Sitzungsberichte der Wiener Akademie. January, 1882. MODERN PETROGRAPHY. 21 reference to the marvellous results recently obtained by the French investigators, Fouque and Michel-Levy, in... the arti- ficial reproduction of volcanic rocks. In their laboratory at the College de France, in Paris, these savans have, within the past few years, succeeded, by using the simplest appara- tus, in synthetically reproducing nearly all the basic lavas in such perfection that even a microscopical examination fails to disclose any essential differences between their productions and those of nature. This has been accomplished by simply fusing in a small furnace* either the powdered minerals of the rock to be formed, or of the ultimate chemical compounds, in proper proportions, which enter into its composition.
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