Contents of Volume XII 



NUMBER I 



PAGE 



Geology of Monadnock Mountain, New Hampshire. Joseph H. 



Perry ------------ i 



On a California Roofing Slate of Igneous Origin. Edwin C. Eckel 15 



On the Chemical Composition of American Shales and Roofing 



Slates. Edwin C. Eckel -------- 25 



Arapahoe Glacier in 1903. Junius Henderson - - - - 30 



The Appalachian River versus a Tertiary Trans -Appalachian River 



in Eastern Tennessee. Charles H. White ----- 34 

 The Contact of the Arch^en and Post-Arch^an in the Region of 



the Great Lakes. A. B. Willmott ------ 40 



The Relationships and Habits of the Mosasaurs. S. W. Williston 43 

 Reviews: Summaries of Pre-Cambrian Literature for 1902-1903, I (C. 



K. Leith), 52; Irrigation, F. H. Newell (L. H. Wood), 62; Gems 



and Gem Minerals, Oliver Cummings Farrington (H. L.), 63. 



Editorial. H. F. B. 65 



Recent Publications - - - - 67 



NUMBER II 



Artesian Well Sections at Ithaca, N. Y. R. S. Tarr - - - 69 

 The Role of Possible Eutectics in Rock Magmas. Alfred C. Lane 83 

 A Fracture Valley System. Joseph P. Iddings - - - - 94 

 Cuspate Forelands along the Bay of Quinte. Alfred W. G. Wilson 106 

 A Contribution to the Study of the Interglacial Gorge Problem. 



George C. Matson - - - 133 



An Interglacial Valley in Illinois. George D. Hubbard - - 152 

 Reviews: Summaries of Pre-Cambrian Literature for 1902-1903, II (C. 



K. Leith), 161; West Virginia Geological Survey, I. C. White (R. D. 



S.), 176; Geographic Influences in American History, Albert Perry 



Brigham; American History and its Geographic Conditions, Ellen 



Churchill Semple (H. H. B.), 176. 

 Recent Publications - - - - 180 



