^A.^r 



PROCEEDINGS 



OF THE 



American Philosophical Society 



HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 



Vol. LIX. 



1920. 



No. 1. 



CONTENTS 



Detection of Submarines. By Harvey C. Hayes, Ph.D. 



The Deep Kansan Pondings in Pennsylvania and the Deposits Therein. 

 By Edward H. Williams, Jr., Sc.D., LL.D. 



49 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL SOCIETY 

 104 South Fifth Street 



1920 



i» . 



