^sb^r 



PROCEEDINGS 



OF THE 



American Philosophical Society 



HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 



Vol. LVI. 



1917. 



No. 2. 



CONTENTS 



Interrelations of the Fossil Fuels. II. By John J. Stevenson . . 53 

 The Names Troyan and Boyan in Old Russian. By J. Dyneley Prince 152 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL SOCIETY 



104 South Fifth Street 



1917 



