THE EVOLUTION OF IGNEOUS ROCKS. 165 



BIBLIOGRAPHY. 



1 JOSEPH PAXSON IDDINGS. The Origin of Igneous Rocks. BidL 



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 1893. 



2 OTTO LANG. Ueber Zeitlichen Bestandwechsel der Vesuvlaven 



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3 Arnold Hague. Geology of the Eureka District, Nevada. 



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7 W. S. BAYLEY. The Basic Massive Rocks of the Lake Superior 



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9 GEORGE BARROW. On certain Gneisses with Round-grained 



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12 HELGE BACKSTROM. Causes of Magmatic Differentiation. 



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Alfred Harker. 



