CONTENTS OF VOLUME IX 



NUMBER V. 



NUMBER VI. 



PAGE 



by Samuel Fortier (G. B. H.), 361 ; The University Geological Survey of 

 Kansas, Vol. IV., Paleontology, Part II, by Samuel W. Williston (S. 

 W.), 362 ; Profiles of Rivers in the United States, by Henry Gannett 

 (G. B. H.), 363; Yearbook of the United States Department of Agricul- 

 ture for 1900 (C), 363. 

 Recent Publications -----,----- 364 



On a Possible Function of Disruptive Approach in the Formation of 



Meteorites, Comets, and Nebulae. T. C. Chamberlin - - - 369 

 Studies for Students : The Constituents of Meteorites, I. O. C 



FARRINGTON ----------- 393 



The Paleozoic Formations of Allegany County, Maryland. Charles 



S. Prosser ----------- 409 



The Deposition of Copper by Solutions of Ferrous Salts. H. C. 



Biddle ------ 430 



Evidence of a Local Subsidence in the Interior. John T. Campbell - 437 



Editorial - - - 439 



Reviews : Summaries of Current North American Pre-Cambrian Literature (C. 



K. Leith), 441 ; On Rival Theories of Cosmogony, by O. Fisher (T. C. 



C), 458; Glacial Sculpture of the Bighorn Mountains, Wyoming, by 



Francois E. Matthes (R. D. S.), 465 ; Annual Report of the Board of 



Regents of the Smithsonian Institution (C), 466. 

 Recent Publications 467 



The River System of Connecticut. William Herbert Hobbs - - - 469 

 Composite Genesis of the Arkansas Valley Through the Ozark 



Highlands. Charles R. Keyes -------- 486 



A Second Contribution to the Natural History of Marl. Charles A. 



Davis ------------- 491 



Perknite (Lime-Magnesia Rocks). H. W. Turner ----- 507 

 The Border-Line Between Paleozoic and Mesozoic in Western 



America. James Perrin Smith - - - - - - - 512 



Studies for Students: The Constituents of Meteorites, II. Oliver C. 



Farrington ------------ 522 



Memorial - - 533 



Editorial - . - - 535 



