CONTENTS OF VOLUME VII v 



PAGE 



Petrographical Province of Essex County, Mass. V. (General Discus- 

 sion and Conclusions.) Henry S. Washington - 463 



A Peculiar Devonian Deposit in Northeastern Illinois. Stuart 



Weller ------------ 483 



Descriptions of New Species of Diplodus Teeth from the Devon- 

 ian of Northeastern Illinois. C. R. Eastman - - - - 489 



Dipterus in the American Middle Devonian. J. A. Udden 494 



Studies for Students. A Century of Progress in Paleontology. Stuart 



Weller - - ' - - ' - - - - - - - - 49° 



Editorial ------------ 599 



Reviews: Recent Books on Physiography: Rivers of North America, by I. 

 C. Russell ; Earth Sculpture, by James Geikie ; Physical Geography, 

 W. M. Davis (R. D. S.), 511 ; Transactions of the Kansas Academy 

 of Sciences, 1897-8 (T. C. C), 516; Annual Report of the Geologi- 

 cal Survey of Iowa, Vol. IX, 1898 (J. W. Finch), 517 - 



Recent Publications - - - 522 



NUMBER VI. 



The Ozarkian and its Significance in Theoretical Geology. Joseph 



Le Conte ------ 525 



An Attempt to Frame a Working Hypothesis of the Cause of 



Glacial Periods on an Atmospheric Basis. T. C. Chamberlin - 545 



The Carbon Dioxide of the Ocean and its Relation to the Carbon 



Dioxide of the Atmosphere. C. F. Tolman, Jr. - - - - 585 



Editorial - 619 



Reviews : The great Ice-dams of Lakes Maumee, Whittlesey, and Warren, 

 by Frank B. Taylor (G. K. G.), 621 ; The Influence of the Carbonic 

 Acid in the Air upon the Temperature of the Ground, by Svante 

 Arrhenius (C. F. Tolman), 623 ; Special Report on Gypsum and 

 Gypsum Cement Plasters, by G. P. Grimsley and E. H. S. Bailey 

 (H. F. Bain), 625 ; American Cements, by Uriah Cummings (H. F. 

 Bain), 627 ------ 



Recent Publications - 628 



NUMBER VII. 



The Pliocene Skull of California and the Flint Implements of 



Table Mountain. Wm. P. Blake - 631 



A Granite-Gneiss in Central Connecticut. Lewis G. Westgate - - 638 



Some Notes on the Lakes and Valleys of the Upper Nugsuak Pen- 

 insula, North Greenland. Thomas L. Watson - 655 



