DARTON.] 



North American geology. 



417 



Geologic PMloaopliy— Continued. 

 Petrology— Continued. 



1887-1889. Obsidian cliff, Yellowstone 

 Pari, IddingB. 



Gneiss-dunite contacts of 

 North Carolina, Chatard. 



Origin of primary quartz in 

 basalt, Iddings. 



History of porphyritic quartz 

 in eruptives, Diller. 



Genetic history of crystalline 

 rocks. Hunt, T. S. 



Report on Rainy Lake region, 

 Lawson. 



Report of division of Petrogra- 

 phy, United States Geolog. 

 ical Survey, Diller. 



[Texture of massive rocks] 

 report of California division. 

 United States Geological Sur- 

 vey, Becker. 

 1890. Origin of soda granites, etc.. 

 Pigeon Point, Bayley. 



Origin of gneiss, Bell. 



Bernardston series, Emerson. 



Primary quartz in basalts. Id- 

 dings. 



Metamorphic phenomena in 

 Massachusetts, Emerson. 



Pre-Cambrian of the Black 

 Hills, Van Hise. 



Greenstone schists of Menom- 

 inee and Marquette regions, 

 Williams, G. H. ; Irving, R. D. 



Granitoid areas in lower Lau- 

 rentian, Hitchcock, Wil- 

 liams, G. H. 



Studies of hornblende schist, 

 Hitchcock, C. H. 



Non-feldspathic intrusives of 

 Maryland, Williams, G. H. 



Granites in Massachusetts, Em- 

 erson. 



Dikes in Kennebunkport, Me., 

 Kemp. 



Archean of central Canada, 

 LawsoB. 



Serpentines of southeastern 

 Pennsylvania, Rand. 



Igneous rocks of Yellowstone 

 Park, Iddings. 



Petrography for 1887 and 1888, 

 Merrill, G. P. 



Schists of Coast ranges of Cali- 

 fornia, Becker. 



BuU. 127 27 



Geologic Philosophy — Continued. 

 Petrology— Continued. 

 1890. Crystallines of Lake Superior 

 region, Irving, Chamberlin 

 and Van Hise. 

 Spherulitic crystallization. Am. 



Geol., Iddings, Cross. 

 Late volcanic eruption in Cali- 

 fornia, Diller. 

 Granites from British Colam- 



bia, Adams, F. D. 

 Alunite and diaspore of Rosita 



•hills, Colo., Cross. 

 Crystalline rooks of Missouri, 



Haworth. 

 Petrographic differentiation in 

 dikes in Rainy Lake region, 

 Lawson. 

 Silicified glass breccia of Sud- 

 bury district, Canada, Wil- 

 liams, G. H. 

 Metamorphism in conglomerate 



schist, Wolflf. 

 Igneous rocks of Arkansas, 



Williams, J. F. 

 Penokee iron series, Irving and 

 Van Hise. 

 Glaciology. 

 1828. On moving stones, Chipman. 

 1833. Report on Massachusetts, 



Hitchcock, E. 

 1837. Geology of Portland and vicin- 

 ity, Hitchcock, E. 



1840. Fourth report of survey of sec- 



ond district of New York, 

 Emmons, E. 



1841. Final report on Massachusetts, 



Hitchcock, E. 

 History of geologic studies in 

 the United States, Hitch- 

 cock, E. 



1842. The glacial theory of Agassiz, 



Maclaren, C. 



Classification of drift, Em- 

 mons, E . 



Remarks on Murchison's ad- 

 dress, Hitchcock, E. 



Lyell on uplift of North Ameri- 

 can terrace, Rogers, H. D. 



Glacial theory of America, 

 Jackson, C. T. 



Remarks on iceberg phenom- 

 ena, Couthouy. 



1843. Strife and furrows in rocks of 



western New York, Dewey, C. 



