PROCEEDINGS 



OF THE 



American Philosophical Society 



HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 

 Vol. LXI. 1922. No. 1. 



CONTENTS 



PAGE 



A Possible Explanation of Upper Eocene Climates, By Edward W. 



Berry ------------ ------i 



The Earth Inductor Compass. By Paul R. Heyl and Lyman J. 

 Briggs -------------------15 



The Probable Action of Lipoids in Growth By D. T. MacDougal - 33 

 The Small Entelodonts of the White River Oligocene. By William 



J. Sinclair ----------- -------53 



Hyracodons from the Big Badlands of South Dakota. By William 



J. Sinclair ------------------65 



The Use of Devices for Indicating Vowel Length in Latin. By John 



C. RoLFE ------------------ 80 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL SOCIETY 



104 South Fifth Street 



1922 



