TITLES OF PAPERS 37 



DARK SCALE OF HARDNESS 

 BY ALFRED C. LANE 



Presented in abstract from notes. 



DEMONSTRATION OF RELATIVE REFRACTION 

 BY ALFRED C. LANE 



Presented in abstract from notes. 



STRATIGRAPHIC STUDY OF THE APPALACHIANS AND CENTRAL STATES 

 WITH REFERENCE TO THE OCCURRENCE OF OIL AND GAS 



BY GEORGE H. ASHLEY 



Presented in abstract from notes. Discussed by H. B. Kiimmel. 



GRANULARITY LIMITS IN PETROGRAPHIC-MICROSCOPIC WORK 



BY FRED. E. WRIGHT 



Presented in abstract without notes. 



ARKANSAS DIAMOND-BEARING PERIDOTITE AREA 

 BY L. C. GLENN 



Presented in full without notes. Discussed by A. H. Purdue. 



NEW MINERALS FROM THE FAVAS OF BRAZIL 

 BY OLIVER CUMMINGS FARRINGTON 



Read by title in the absence of the author. 



RESINS IN PALEOZOIC COALS 

 BY DAVID WHITE 



Presented in full without notes. 



ONYX DEPOSITS IN EAST TENNESSEE 

 BY C. H. GORDON 



Presented in full without notes. 



VARIATION OF THE OPTIC ANGLE OF GYPSUM WITH TEMPERATURE 



BY EDWARD H. KRAUS 



Presented in full without notes. 



PARAGENESIS OF THE ZEOLITES 

 BY J. VOLNEY LEWIS 



