PROCEEDINGS 



V dL^*^" OF THE 



American Philosophical .Society 



HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 



Vol. LV. 1916. No. 2. 



CONTENTS 



Interrelations of the Fossil Fuels. 



I 



By John J. Stevenson 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL SOCIETY 



104 South Fifth Street 



1916 



