226 PROCEEDINGS OF THE SOCIETY OF ECONOMIC GEOLOGISTS 



REFLECTED HILLS IN PETROLEUM GEOLOGY 



BY SIDNEY POWERS 



Read in abstract by Waldemar Ljndgren in the absence of the author. 



STUDY OF 8UPERGENE PROCESSES AT NEISART, MONTANA 



I3Y M. E. HURST 



Discussed by J. E. Spurr, E. S. Bastm, L. C. Graton, H. G. Ferguson, 

 G. F. Loughlin, W. A. Parks, A. F. Rogers, and A. M. Bateman. 



GEOLOGICAL AND GEOGRAPHICAL OCCURRENCE OF PRECIOUS STONES 



BY SYDNEY H. BALE 



Read in abstract by A. M. Bateman in the absence of the author. 

 Discussed by G. F. Loughlin, R. W. Stone, John E. Dresser. 



SOME ETCHING TESTS ON PYRRHOTITE 



BY H. C. BOY DELL 



Read by title in the absence of the author. 



CONDITION OF MAGNESITE IN 1920 

 BY R. W. STONE 



Discussed by E. S. Bastin, G. F. Loughlin, R. W. Stone, and A. M. 

 Bateman. 



