CONTENTS 3 



Page 

 Microscopic structural features of the banded glacial slate of 

 Permocarboniferous age at Squaiitum, Massachusetts [ab- 

 stract] ; by Robert W. Sayles 152 



Weathering of allanite [al)stract] ; l)y Thomas L, Watson 152 



Origin of dolomite as disclosed by stains and other methods [ab- 

 stract] ; by Edward Steidtmann 153 



Some further consideration of the forces developed in crystal 



growth ; by Arthur L. Day 154 



I'roblem of the anorthosites [abstract] ; by N. L. Bowen 154 



Classification of metamorijhic 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 Penn- 

 sylvania [abstract] ; by Edgar T. Wherry 156 



Symposium on the Geology of Petroleum 156 



General geological conditions and future supply; by RMl])h Arnold. 156 



Appalachian oil fields ; by M. L. Fuller. , 156 



Illinois oil field ; by Fred H. Kay 156 



Ohio-Indiana oil field ; by J. A. P>ownocker 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 recov- 

 ery ; by I. 0. White 157 



Latest theories regarding the origin of oil ; by David White 157 



Titles and abstracts of papers presented before the afternoon session 



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 158 



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 [ab- 

 stract] ; by Sidney Powers 159 



The philosophy of geology and the order of the State ; Presidential 



address by John M. Clarke 159 



Session of Friday, December 29 160 



Titles and abstracts of papers presented before the morning session 



and discussions thereon 160 



Development of three successive peneplains in Kansas [abstract] ; 

 by J. W. Beede. ,,,,,,,.,,.,, , 160 



