Contents of Volume XIX 



NUMBER I 



PAGE 



Climate and Physical Conditions op the Keewatin. A. P. Coleman i 



The Agency of Manganese in the Superficial Alteration and 



Secondary Enrichment of Gold Deposits. William H. Emmons 1 5 

 Local Decomposition of Rock by the Corrosive Action of Pre- 



Glacial Peat-Bogs. Edwin W. Humphreys and Alexis A. Julien 47 

 The Focus of Post-Glacial Uplift North of the Great Lakes. 



J. W. Spencer ......... 57 



A Geological Route Through Central Asia Minor. William T. 



M. Forbes 61 



The Variations of Glaciers. XV. Harry Fielding Reid . . 83 

 Reviews ........... 90 



NUMBER II 



The Southerly Extension of the Onondaga Sea in the Alle- 

 gheny Region. E. M. Kindle . .' . . . 97 



The Mississippian-Pennsylvanian Unconformity and the Sharon 



Conglomerate. G. F. Lamb . . . . . .104 



The Wichita Formation of Northern Texas. C. H. Gordon, 



George H. Girty, and David White . . . . . .110 



Notes on the Osteology of the Skull of Pariotichus. E. B. 



Branson . . . . . . . . . 135 



High Terraces and Abandoned Valleys in Western Pennsylvania. 



Eugene Wesley Shaw . . . . . . . .140 



Requisite Conditions for the Formation of Ice Ramparts. 



William H. Hobbs . . . . . . . . .157 



The Terminal Moraine of the Puget Sound Glacier. J. Harlen 



Bretz ........... 161 



Editorial: 



The Seeding of Worlds. T. C. C. 175 



Artesian Waters of Argentina. B. W. . . . . 178 



Petrographical Abstracts and Reviews . . . . .181 



Reviews ........... 180 



