APR 21 1916 



PROCEEDINGS 



H 'X^^ OF THE 



American Philosophical Society 



HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 



Vol. LV. 1916. No. 1. 



CONTENTS 



The Geology of Parahyba and Rio Grande do Norte, Brazil, 

 By Ralph H, Soper 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL SOCIETY 



104 South Fifth Street 



1916 



