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107. W. Cross, Jour. Geology, 10, 451, 1902.
108. Ibid., p. 45.
109. Sorby, Quart. Jour. Geol. Soc., 14, 453, 1858.
110. Zirkel, Einführung des Mikroskops in das mineralogisch-geologische Studium, 1881.
111. Williams, G. H., Modern Petrography, 1886.
112. Zirkel, Mikroskopische Beschaffenheit der Mineralien und Gesteine.
113. Rosenbusch, Mikroskopische Physiographie der petrographisch wichtigen Mineralien.
114. Zirkel, Mikroskopische Gesteinstudien, Sitzung vom 12 März, 1863.
115. Julien and Wright, Geol. Surv. of Michigan, 2, 1873. Appendices A and C.
116. Dana, E. S., the Journal, 8, 390–392, 1874.
117. Zirkel, Geological Exploration of the 40th Parallel; vol. VI, Microscopical Petrography.
118. Caswell, Microscopical Petrography of the Black Hills. U. S. Geog. and Geol. Surv. Rocky Mts. Rep. on Black Hills of Dakota, 469–527. The separate copies issued bear the imprint 1876; the complete report 1880.
119. Dana, E. S., Igneous Rocks in the Judith Mts. Rep. of Reconnaissance Carroll, Mont., to Yellowstone Park in 1875. Col. Wm. Ludlow, War Dept., Washington, 105–106.
120. Hawes, G. W., Rocks of the Chlorite Formation, etc., the Journal, 11, 122–126, 1876. Greenstones of New Hampshire, etc, ibid., 12, 129–137, 1876.
121. Hawes, G. W., the Journal, 21, 21–32, 1881.
122. Brögger, Die silurischen Etagen 2 und 3, Kristiania, 1882.
123. The references for the papers alluded to, all of them in the Journal, are as follows:
Emerson, 24, 195–202, 270–278, 349–359, 1882;
——, 23, 302–308, 1882.
Cross, 27, 94–96, 1884; 31, 432–438, 1886; 39, 359–370, 1890; 41, 466–475, 1891; 23, 452–458, 1882.
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, 1888; 36, 254–259, 1888.
——, 34, 137–145, 1887.
Diller, 32, 121–125, 1886; 37, 219–220, 1889;
——, 33, 45–50, 1887.
Irving (26, 27–32, 321–322, 27, 130–134, 1883; 29, 358–359, 1885).
Kemp (35, 331–332, 1888; 36, 247–253, 1888; 38, 130–134, 1889).
124. Zirkel, Lehrbuch der Petrographie, 2d ed., 1893.
125. Hunter and Rosenbusch, Ueber Monchiquit, etc., Min. petr. Mitth., 11, 445, 1890. Rosenbusch, Ueber Structur und Class. der Eruptivgesteine, ibid., 12, 351, 1891.
126. Iddings, Origin of Igneous Rocks, Bull. Phil, Soc. Washington, 12, 89–213, 1892.
127. Brögger, Mineralien der Syenit-pegmatit-gànge, etc., Zs. Kryst., 16, 1890.
128. ——, Basic Eruptive Rocks of Gran, Quart. Jour. Geol. Soc., 50, 15, 1894; Grorudit-Tinguait-Serie, Vidensk. Skrift. 1 Math. nat. Kl., No. 4, 1894.
129. Weed and Pirsson, e. g. Shonkin Sag, the Journal, 12, 1–17, 1901.
130. The references for the articles mentioned (all in the Journal) are as follows:
Becker, 46, 1893; 4, 257, 1897; 3, 21–40, 1897.
Cross, 39, 657–661, 1915.
Adams, 22, 95–123, 1906; 29, 465–487, 1910.
Daly, 22, 195–216, 1906; 26, 17–50, 1908.
Wright, 22, 224–230, 1906.
Fenner, 29, 217–234, 1910.
Bowen, 39, 175–191; 40, 161–185, 1915.
Pirsson, 50, 116–121, 1895; 7, 271–280, 1899.
Smyth, 36, 33–46, 1913.
Murgoci, 20, 133–145, 1905.
Barrell, 13, 279–296, 1902.
Lindgren, 3, 301–314, 1897; 9, 269–282, 1900.
Ransome, 5, 355–375, 1898.
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Hague, 1, 445–457, 1896.
Pogue, 28, 218–238, 1909.
Warren, 25, 12–36, 1908.
Goldman, 39, 261–288, 1915.
Washington and Pirsson, Belknap Mts., 20, 344–353, 1905; 22, 439–457, 493–515, 1906.
——, Red Hill, 23, 257–276, 433–447, 1907.
——, Tripyramid Mt., 31, 405–431, 1911.
131. Quantitative Classification of Igneous Rocks, Cross, Iddings, Pirsson and Washington, Chicago, 1903.
Petrogenesis, C. Doelter, Braunschweig, 1906.
Igneous Rocks, vols. 1 and 2, J. P. Iddings, New York, 1909 and 1913.
Problem of Volcanism, Iddings, New Haven, 1914.
Natural History of Igneous Rocks, Alfred Harker, London, 1909.
Igneous Rocks and their Origin, R. A. Daly, New York, 1914.
132. Among these may be mentioned:
Rosenbusch u. Wülfing, Physiog. der petrog. wicht. Min., Stuttgart, 1905.
Iddings, J. P., Rock-Minerals, 1st ed., New York, 1906.
Johannsen, A., Manual of Petrographic Methods, New York, 1914.
Winchell, N. H. and A. N., Elements of Optical Mineralogy, New York, 1909.
133. We may mention here, for example, the work in mineralogy of Penfield, noticed in the accompanying chapter on mineralogy. In addition to the accurate determination of the composition and constants of many minerals, some of which have importance from the petrographic standpoint, we owe to him more than anyone the recognition of fluorine and hydroxyl in a variety of species, and thereby the perception of their pneumatolytic origin. His papers have been published almost entirely in the Journal.
134. Wright, Methods of Petrographic-Microscopic Research, Carnegie Inst., Washington, 1911, and various papers; many in the Journal.
135. Conf. Wright’s work quoted above and the various manuals previously mentioned.
136. Kemp, Hand-book of Rocks, 3d ed., New York, 1904. Pirsson, Rocks and Rock-Minerals, New York, 1910.
137. Williams, G. H., U. S. Geol. Surv., Bull. 62, Washington, 1890.
138. Van Hise, Treatise on Metamorphism, U. S. Geol. Surv., Monograph 17.
139. F. W. Clarke, U. S. Geol. Surv., Bull. 591, 1915.
140. Hillebrand, Analysis of Silicate and Carbonate Rocks, U. S. Geol. Surv., Bull. 422, 1910.
141. Washington, Chemical Analysis of Rocks, pp. 200, New York, 1910.
142. Id., Chemical Analyses of Igneous Rocks (1884–1900), U. S. Geol. Surv., Prof. Paper, No. 14, 1903.
143. Osann, Beitr. zu chem. Petrogr., II Teil. Anal. d. Eruptivgest., 1884–1900, Stuttgart, 1905.
144. Washington, ibid., 2d ed., U. S. Geol. Surv., Prof. Paper 99, pp. 1216, 1917.
145. Clarke, U. S. Geol. Surv., Bull. 616, 1916.
146. Fouqué and Michel-Lévy, Synthese des Mineraux et des Roches, Paris, 1882.
147. Morozewicz, Exper. Untersuch. u. Bildung der Min. im Magma, Min. petr. Mitt., 18, 1898.
148. Doelter, Synthetische Studien, N. Jahrb. Min. 1897, 1, 1–26. Allg. chem. Mineralogie, etc.
149. Tamman, Krystallisieren und Schmelzen, 1903.
150. St. Meunier, Les Méthodes de Synthèse en Minéralogie, Paris, 1891.
151. Vogt, Mineralbildung in Smelzmassen, Christiania, 1892; Silikatschmelzlösungen, 1 and 2, 1903, 1904, and various other papers, esp. in Min. petr. Mitt., vols. 24 and 25, 1906.
152. H. E. Boeke, Grundlagen der physikalisch-chemischen Petrographie, Berlin, 1915.