CONTENTS V 



Page 



Theory of isostasy — a geological problem [title] ; by William 

 Bowie 1VI 



Condition of the earth's crust and the earlier American 

 gravity determinations [title] ; by Geogre R. Putnam .... 113 



Some considerations touching on isostasy [title] ; by H. O. 

 Wood 114 



Isostasy and earth movements [title] ; by Harry Fielding 

 Reid 114 



Isostasy and applied geology [title]; by James F. Kemp.... 114 



Folding of mountain ranges — the argument from isostasy 

 [title] ; by Sir Sidney Burrard 114 



Isostatic compensation considered as a cause of thrusting 

 [title] ; by Andrew C. Lawson 114 



Isostasy and rock density [title] ; by Henry S. Washington 114 



Weight of sediments per unit volume [title] : by Alfred C. 

 Lane 114 



Role of isostatic stress [title] ; by Bailey Willis 114 



Session of Thursday afternoon 11") 



Titles and abstracts of papers presented at the afternoon session 

 and discussions thereon 115 



Comparative study of the Nebraskan and Kansan tills in Iowa 

 [abstract] ; by George F. Kay 115 



Further data on the differentiation of the glacial drift sheets 

 of northern Illinois [abstract and discussion] : by M. M. 

 Leighton 110 



Late Pleistocene history of the Lower Mohawk and Middle 

 Hudson region [abstract] ; by James H. Stoller 117 



Ablation of the eastern lobe of the Wisconsin ice-sheet [ab- 

 stract] ; by John H. Cook . 117 



Preliminary notes on the shorelines of glacial Lake Nashua, 

 near Fitchburg. Massachusetts [abstract] ; by Thomas C. 

 Brown lis 



Map of the Pleistocene lakes of the Basin-and-Range prov- 

 ince, and its significance [abstract and discussion] ; by 

 O. E. Meinzer 118 



Is the channel of the Missouri River through North Dakota 

 of Tertiary origin? [abstract] ; by James E. Todd 120 



Former courses of the Androscoggin River [abstract] ; by 

 Irving B. Crosby 121 



Peneplains and the geographic cycle ; by .W. M. Davis 121 



Retrograding of offshore bars [abstract] : by Douglas W. 

 Johnson 121 



Role of crosswaves in the formation of tomboloes and points 

 [abstract and discussion] ; by Roswell H. Johnson 122 



Geology of the Colorado River in southeastern Utah [ab- 

 stract] ; by C. R. Longwell, H. D. Miser, R. C. Moore, and 

 Sidney Paige 122 



