DABTON.] 



NORTH AMERICAK GEOLOGY. 



415 



Geologic Philosophy— Continued. 

 Petrology— Continued. 



1882. Summary of geology of Com- 



stook lode, Becker. 



Composition of Mesozoic dia- 

 base of Atlantic Slope^Hawes. 



Peat at Scranton, Pa., Fair- 

 child. 



Crystallines of Wisconsin Val- 

 ley, Irving, Van Hise and 

 Clark. 



1883. General geology of Wisconsin, 



Chamberlin, T. C. 



Rock genesis, early history of 

 the American continent, 

 Hitchcock, C. H. 



Progress of geology for 1882, 

 Hunt, T. S. 



Filling of veins and cavities, 

 Keweenaw Point, Wads- 

 worth. 



Meteoric and terrestrial rocks, 

 Wadsworth. 



Induration of rocks hy atmos- 

 pheric action, Wadsworth. 



History of serpentine and notes 

 on pre-Camhrian rocks, Hunt, 

 T.S. 



Copper rocks of Lake Superior, 

 Irving, R. D. 



Physical constants of rooks. 

 King, C. 



Unsolved problems on geology, 

 Dawson, J. W. 



Nature of induration in sand- 

 stones in Minnesota, Irving, 

 R. D. 



Origin of hornblende of crys- 

 tallines of Northwest, Irving, 

 R. D. 



1884. Genesis of crystalline rocks, 



Hunt, T. S. 

 Copper and iron districts of 



Lake Superior, Wadsworth. 

 Studies of rocks of Cordilleras, 



Wadsworth. 

 Gabbros and hornblende rocks 



near Baltimore, Williams, 



G. H. 

 Petrography of the fortieth pa- 

 rallel, Zirkel. 

 The fortieth-parallel rocks, 



Wadsworth. 

 Lateral-secretion theory of ore 



deposits, Wadsworth. 



Geologic Philosophy — Continued. 

 Petrology— Continued. 



1884. So-called quartz porphyry at 



HoUins, Md., Williams, G. H. 



Paramorphosis of pyroxene to 

 hornblende, Williams, G. H. 



Azoic system and its subdivi- 

 sions, Whitney and Wads- 

 worth. 



1885. Divisibility of Archean in the 



Northwest, Irving, R. D. 



Rock notation for geological 

 diagrams, Dana, J. D. 



Enlargements of hornblende 

 fragments, Van Hise. 



Canadian and Archean and 

 Irish metamorphics, Kina- 

 han, G. H. 



Dikes of apparently eruptive 

 granite near Baltimore, Wil- 

 liams, G. H. 



Enlargement of fragments in 

 certain rocks, Irving and Van 

 Hise. 



Geology of the Scottish High- 

 lands, Hunt, T. S. 



Progress of geology for 1883 

 Hunt, T. S. 



Origin of crystalline rocks. 

 Hunt, T. S. 



Archean of the Northwest, Irv- 

 ing, R. D. 



Pressure fluxion in Pennsyl- 

 vania, Lewis, H. C. 



Enlargement of fragments in 

 certain rocks, Irving and Van 

 Hise. 



Notes on stratigraphy of Cali- 

 fornia, Becker. 



Notes on metamorphism, Ste- 

 venson. 



Igneous rocks of Washoe, Nov., 

 Hague and Iddings. 



Copper rocks of Lake Superior, 

 Irving, R. D. 



Geology of mouth of Narragan- » 

 sett Bay, Dale. 



Archean of the Northwest, 

 Irving, R. D. 



Notice of Lehmann on origin of 

 crystalline schists, Williams, 

 G. H. 



1886. Terms applied to metamor- 



phism and porphyritio struc- 

 ture, Dana, J, D. 



