PETROIDGICAL ABSTRACTS AND REVIEWS 533 



Milch, L. "Die Systematik der Eruptivgesteine. Erster Teil," 

 Fortschr. d. Min. Kristallog. u. Petrog., Ill (1913), 189-227. 

 A history of the development of mineralogical classifications of rocks. 

 Chemical classifications are to be treated in the volume for 1914. 



- A. J. 



Miller, Benjamin L. "The Geology of the Graphite Deposits of 

 Pennsylvania," Econ. GeoL, VII (1912), 762-77. 



Miller, William J. "The Garnet Deposits of Warren County, 

 New York," Econ. Geol., VII (1912), 493-501. 

 The author believes the garnets to be due to the assimilation of the 

 Grenville sediments by the intruded igneous rocks. 



A. J. 



Miller, William I. "Contact Action of Gabbro on Granite in 

 Warren County, New York," Science, XXXVI (191 2), 490-92. 

 The author distinguishes nine zones, passing from the typical gabbro 

 to the typical granite country rock. He gives the mineralogical com- 

 position of each zone. 



A. J. 



Moore, Elwood S. " Hydro thermal Alteration of Granite and the 

 Source of Vein-Quartz at the St. Anthony Mine," Econ. Geol., 

 VII (1912), 751-61. 



Paige, Sidney. "The Geologic and Structural Relations at Santa 

 Rita (Chino), New Mexico," Econ. Geol., VII (191 2), 547-59. 



Paige, Sidney. "The Origin of Turquoise in the Burro Mountains, 

 New Mexico," Econ. Geol. VII (191 2), 382-92. 

 The author gives arguments both for the deep-seated origin of tur- 

 quoise and for its origin in the zone of weathering. He apparently 

 inclines to the latter belief. 



A. J. 



Ramsay, Wilhelm. " Beitrage zur Geologie der Halbinsel Kanin," 



Fennia, XXXI (191 1), No. 4, pp. 45. 



A geologic history of the Kanin Peninsula. An analysis of diabase 



is given. 



A.J. 



