CONTEXTS 6 



Page 



War-time development of the optical industry [abstract] ; by F. E. 



Wright 103 



Geologic and present climates ; by Marsden Manson 103 



Conditions of deposition of some Tertiary petroliferous sediments 

 [abstract] ; by Amadeus W. Grabau 103 



Phosphate rock an economic army [abstract] ; by R. W. Stone. . . 104 



Prevailing stratigraphic relationsliips of the bedded phosphate 

 deposits of Europe, North Africa, and North America [ab- 

 stract] ; by Amadeus W. Grabau 104 



Session of Saturday afternoon, December 28 104 



Titles and abstracts of papers presented at the afternoon session 104 



Principles in the determination of boundaries [abstract] ; by Al- 

 bert P. Brigham 105 



Geographic description of army cantonments and of United States 

 boundary regions ; by M. R. Campbell 106 



Signal Corps School of Meteorology [abstract] ; by Oliver L. 

 Fassig 106 



World view of mineral wealth [abstract] ; by Joseph B. Umpleby. 107 



Internationalization of mineral resources [abstract] ; by C. K. 

 Leith 107 



Commercial control of the mineral resources of the world [ab- 

 stract] ; by Josiah Edward Spurr 108 



Mexican petroleum and the war [abstract] ; by E. W. Shaw 109 



American mapping in France ; by Glenn S. Smith 110 



The American topographer in the role of artillery orientation 

 officer ; by F. E. Matthes 110 



The method of aerial topographic mapping ; by Fred H. Mofflt and 

 J. W. Bagley 110 



A plane-table for military mapping [abstract] ; by Alan M, Bate- 

 man Ill 



Sand-chrome deposits of Maryland [abstract] ; by Joseph T. 

 Singewald, Jr Ill 



Cartersville potash slates : their economic relation to chemical 

 and industrial post-war development [abstract] ; by T. Poole 

 Maynard 112 



Anticlinal theory, as applied to some quicksilver deposits [ab- 

 stract] ; by Johan August Udden 112 



Crystalline graphite deposits of Alabama [abstract] ; by W. E. 

 Prouty 112 



Further evidence of the age of the crystalline and semicrystalline 

 rocks in Alabama [abstract] ; by W. E. Prouty 113 



Contribution to the origin of dolomite [abstract] ; by W. A. Tarr. 114 



Magnesite industry [abstract] : by R. W. Stone 115 



Certain aspects of glaciation in Alaska [abstract] ; by Warren O. 



Crosby 115 



Papers transferred to Paleontological Society 115 



Vote of thanks 116 



Annual dinner 116 



Cablegram to Societe Geologique de France 116 



