224 PROCEEDINGS OF THE SOCIETY OF ECONOMIC GEOLOGISTS 



The following program was then taken up : 



PRESENTATION OF PAPERS 



THE SOCIETY OF ECONOMIC GEOLOGISTS— ITS SPHERE AND FUTURE 



PRESIDENTIAL ADDRESS BY R. A. F. PENROSE, JR. 



PLAIN GEOLOGY 



BY GEORGE OTIS SMITH 



The paper was discussed by J. E. Spurr, Kobert Anderson, L. C. 

 Graton, A. M. Bateman, Waldemar Lindgren, and H. G. Ferguson. 



GEOLOGY OF THE BRADEN MINE, CHILE 

 BY WALDEMAR LINDGREN AND EDSON Si BASTIN 



The paper was read by the senior author and discussed by A. M. Bate- 

 man. L. C. Graton, J. E. Spurr, and others. 



STRESSING ECONOMICS IN THE TEACHING OF ECONOMIC GEOLOGY 



BY EDSON S. BASTIN 



The paper was discussed by George Otis Smith, J. E. Spurr, and 

 R. W. Stone. 



OIL AND GAS SECTION OF THE COURSE IN ECONOMIC GEOLOGY 



BY R. H. JOHNSON 



EXPERIMENTAL STUDY OF THE INVASION OF OIL INTO A WATER-WET SAND 



BY O. W. SKIRVIN 3 



Discussed by R. H. Johnson. 



RESULTS OBTAINED BY IMPROVED METHODS OF EXTRACTING PETROLEUM 



BY ROBERT B. BOSSLER 4 



PROBABLE ORIGIN OF CERTAIN VEIN STRUCTURES 

 BY L. C. GRATON 



A RECENT HOT-SPRING DEPOSIT IN BOLIVIA 

 BY WALDEMAR LINDGREN 



I SI GGESTION FOR THE TERMINOLOGY OF CERTAIN ORE DEPOSITS 



BY WALDEMAR LINDGREN 



:! Introduced by R. II. Johnson. 

 * Introduced by G. II. Ashley. 



