EARTH 



SCIENCES 



UB8ARY 



PUBLICATION COMMITTEE: 



HENRY SKINNER, M.D., Sc.D. WITMER STONE, A.M., Sc.D, 

 HENRY A. PILSBRY, Sc.D. WILLIAM J. Fox 



EDWARD J. NOLAN, M.D. 



EDITOR : HENRY A. PILSBRY. 

 TREASURER : S. RAYMOND ROBERTS. 



