PROCE EDINGS 



OF THE 



A.MERICAN PHILOSOPHICAL SOCIEIT 



HELD AT PniLADELPnU FOR PROMOTING ISEPll KNOWLEDGE. 



Vol. XL[,- April, ia02. No. 170 



CONTENTS 



PAGE 



A Cretaceous and Lower Tertiary Section in Soutli Central Montana 



(with'^plate). By Earl Douglass 207 



Areograpliy. By Perciyal Lowell 225 



Systematic Geography, By W. M. Datis 235 



Stated Meeting, April 18 259 



The First Assembly Account — Philadelphia, 1748. By Thomas 



Willing Balch 260 



Stated Meeting, May 2 264 



Stated Meeting, May 16 * 264 



' philadelphia : 

 The American Philosophical Society, 

 104 South Fifth Street. 

 1902. 



