EARTH 

 SCIENCES 







x u 



PUBLICATION COMMITTEE 



SAMUEL GIBSON DIXON, M. D., LL.D., President of the Academy. 

 HENRY SKINNER, M. D., So. D., WITHER STONE, A. M., Sc.D., 



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



EDWARD J. NOLAN,M.D. 

 Treasurer: S. RAYMOND EGBERTS. 



