158 TROCEEDINGS OF THE SOCIETY OF ECONOMIC GEOLOGISTS 



The se.ssions of the Society were called to order by President Penrose, 

 and scientific papers were read according to the program. 



PRESENTATION OF PAPERS 



HE NATION OF ECONOMIC GEOLOGY TO THE GENERAL PRINCIPLES OF 



GEOLOGY 



BY R. A. F. PENROSE, JR. 



NICKEL SULPHIDES AND THE POSSIBILITY OF ENRICHMENT OF NICKEL 



ORES 



BY WALDEMAR LINDGREN 



SCIENTIFIC BY-PRODUCTS OF APPLIED GEOLOGY 

 BY GEORGE OTIS SMITH 



This paper was read by Philip Sidney Smith, in the absence of the 

 author. 



RESULTS OF EXPERIMENTAL WORK ON THE ACCUMULATION OF OIL IN 



SANDS 



BY W. H. EMMONS AND GEORGE THIEL 



ADDITIONAL NOTES ON THE ZONAL DISTRIBUTION OF DIFFERING ORES, 

 OUTWARDLY FROM AN IGNEOUS SOURCE 



BY J. F. KEMP 



A BIBLIOGRAPHY OF ECONOMIC GEOLOGY 



BY D. F. HEWETT 



Session of Wednesday, December 29, 1920 



presentation of papers 

 influence of spacing of oil wells on acre yield 



BY ROSWELL H. JOHNSON 



NOTES ON THE ORIGIN OF THE SILVER ORES OF THE COM STOCK LODE 



BY EDSON S. BASTIN 



MC KEESPORT: A STUDY IN POLITICAL AND ECONOMIC GEOLOGY 



BY GEORGE H. ASHLEY 



