CONTENTS V 



Page 

 Origin of dolomite as disclosed by stains and other methods 



[abstract] ; by Edward Steidtmann 153 



Some further consideration of the forces developed in crystal 



growth ; by Arthur L. Day 154 



Problem of the anorthosites [abstract] ; by N. L. Bowen 154 



Classification of metamorphic rocks [abstract] ; by William 



J. Miller 155 



Relationship between the igneous and metamorphic rocks of 

 the District of Columbia and vicinity [abstract] ; by C. N. 



Fenner 155 



Precambrian sedimentary rocks in the highlands of eastern 



Pennsylvania [abstract] ; by Edgar T. Wherry 156 



Symposium on the Geology of Petroleum 156 



General geological conditions and future supply ; by Ralph 



Arnold 156 



Appalachian oil fields ; by M. L. Fuller 156 



Illinois oil field ; by Fred PI. Kay 156 



Ohio-Indiana oil field ; by J. A. Bownocker. . 156 



Pacific Coast oil field ; by R. W. Pack 157 



Mid-continent oil fields ; by James H. Gardner 157 



Rocky Mountain oil fields ; by F, A. Fisher 157 



Gulf Coast oil field ; by G. D. Harris 157 



Canadian oil field ; by W. G. Miller 157 



Productivity of oil shales ; by David T. Day 157 



Practical application of geological structure theories to oil 



recovery ; by I. C. White 157 



Latest theories regarding the origin of oil ; by David AVhite . . 157 

 Titles and abstracts of papers presented before the afternoon ses- 

 sion and discussions thereon 157 



Ethics of the petroleum geologist [abstract] ; by Frederick G. 



Clapp 157 



Revision of structural classification of petroleum and natural 



gas fields [abstract] ; by Frederick G. Clapp 15S 



Intermolecular attractions and oil and gas accumulation [ab- 

 stract] ; by Eugene Wesley Shaw 158 



Relation of structure to the production of oil and natural gas 



in the mid-continent field [abstract] ; by Charles N. Gould 158 

 Ordovician strata beneath the Healdton oil field, Oklahoma 



[abstract] ; by Sidney Powers * 159 



The philosophy of geology and the order of the State ; Presi- 

 dential address by John M. Clarke 159 



Session of Friday, December 29 160 



Titles and abstracts of papers presented before the morning ses- 

 sion and discussions thereon 160 



Development of three successive peneplains in Kansas [ab- 

 stract] ; by J. W. Beede 160 



Hypothesis for the relation of normal and thrust-faults in 

 eastern New York [abstract] ; by George Halcott Oh ad- 

 wick , 160 



