670 ABSTRACTS OF PAPERS 



Page 

 Petrology of a series of nepheline syenite, camptohite, mohchlquite7 and " 

 diabase dikes in Middle Shenandoah Valley, Virginia [abstract] ; by 



Thomas L. Watson and Justus H. Cline 082 



Northumberland volcanic plug [discussion] ; by H. P. Cushing 683 



Lavas of Hawaii and their relations [abstract] ; by Whitman Cross 684 



Production of apparent diorite by metamorphism [abstract] ; by Arthur 



Keith 684 



Media of high refraction and some standard media of lower refraction for 

 the determination of refractive indices with the microscope [abstract] ; 



by H. E. Merwin 685 



Certain so-called meteoric irons of Canyon Diablo [abstract] ; by Charles 



R. Keyes • • • • • • 685 



New occurrence of monazite in North Carolina [abstract] ; by Joseph Hyde 



Pratt ... 686 



New occurrence of pisanite and some large staurolites from Ducktown, 



Tennessee [abstract] ; by Frank R. Van Horn 686 



Speculative nature of geology [abstract] ; by W. M. Davis 686 



Bearing of recent climatic investigations on geological theories [abstract 



and discussion] ; by Ellsworth Huntington 687 



Piedmont terraces of the northern Appalachians and their mode of origin 



[abstract and discussion] ; by Joseph Barrell 688 



Post- Jurassic history of the northern Appalachians [abstract and discus- 

 sion] ; by Joseph Barrell *• . . . 690 



Recent changes in the Asulkan Glacier [abstract] ; by 'Heinrich Ries 696 



Evidence of very early glaciation in Ohio [abstract] ; by George D. Hub- 

 bard 696 



Beginnings of Lake Agassiz [abstract] ; by Frank Leverett 697 



Remarkable deformation of the Algonquin Beach [abstract and discussion] ; 



by Frank Leverett 697 



Pleistocene succession in Wisconsin [abstract] ; by Samuel Weidman 697 



Iowan drift [abstract and discussion] ; by Frank Leverett 698 



Canyon and delta of the Copper River in Alaska [abstract] ; by Lawrence 



Martin .699 



Submarine chamsecyparis bog at Woods Hole, Massachusetts, and its rela- 

 tion to the problem of coastal subsidence [abstract] ; by Douglas W. 



Johnson 699 



Contra-imposed shorelines [abstract] ; by Charles H. Clapp 700 



Peat deposit of geological interest near New Haven, Connecticut [ab- 

 stract] ; by Charles A. Davis 700 



Early Paleozoic physiography of the southern Adirondacks [abstract] ; by 



William J. Miller 701 



Level of maximum precipitation as a factor in the glaciation of Mount 



Rainier [abstract] ; by F. E. Matthes 701 



Characters of the older sections of the Niagara Gorge and their correlation 



with Great Lakes history [abstract] ; by Frank B. Taylor 702 



Mierostrueture of titaniferous magnetites [abstract] : by Joseph T. Singe- 



wald. Jr 704 



Origin of granites as well as metacrystals by selective solution — a recanta- 

 tion [abstract and discussion] ; by Alfred C. Lane 704 



