sty 2 



PROCEEDINGS 



OF THE 



American Philosophical Society 



HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 



Vol. LIV. August, 19 15. No. 218. 



CONTENTS 



The Role of the Glacial Anticyclone in the Air Circulation of the 



Globe. By William Herbert Hobbs ------- 185 



The Test of a Pure Species of (Enothera. By Bradley Moore Davis 226 



Concretions in Streams Formed by the Agency of Blue Green Algae 



and Related Plants. By H. Justin Roddy, M.S., Ph.D. - 246 



The Conditions of Black Shale Deposition as Illustrated by the Kup- 



ferschiefer and Lias of Germany. By Charles Schuchert - 259 



On the Rate of Evaporation of Ether from Oils and its Application in 

 Oil -ether Colonic Anesthesia. 



By Charles Baskerville, Ph.D., F.C.S. 270 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL SOCIETY 

 104 South Fifth Street 



1915 



