RISE OF PETROLOGY AS A SCIENCE 265 



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*W. Cross, Jour. Geology, 10, 451, 1902. 

 2 Ibid., p. 45. 



8 Sorby, Quart. Jour. Geol. Soc., 14, 453, 1858. 



4 Zirkel, Einf iihrung des Mikroskops in das mineralogisch-geologische 

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6 Williams, G. H., Modern Petrography, 1886. 



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8 Zirkel, Mikroskopische Gesteinstudien, Sitzung vom 12 Marz, 1863. 

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10 Dana, E. S., the Journal, 8, 390-392, 1874. 



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13 Dana, E. S., Igneous Eocks in the Judith Mts. Eep. of Eeconnaissance 

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15 Hawes, G. W., the Journal, 21, 21-32, 1881. 



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Emerson, 24, 195-202, 270-278, 349-359, 1882; 



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 Iddings, 26, 222-235, 1883; 



, 27, 453-463, 1884; 



- , 36, 208-221, 1888; 

 - , 33, 36-45, 1887. 



Williams, 31, 26-41, 1886; 33, 135-144, 191-199, 1887; 35, 433-448, 

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, 34, 137-145, 1887. 



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Irving (26, 27-32, 321-322, 27, 130-134, 1883; 29, 358-359, 1885). 

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Biddings, Origin of Igneous Eocks, Bull. Phil, Soc.. Washington, 12, 



Mineralien der Syenit-pegmatit-gange, etc., Zs. Kryst, 16, 



, Basic Eruptive Eocks of Gran, Quart. Jour. Geol. Soc., 50, 

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 4 



4, 1894. 



