12 IOWA ACADEMY OF SCIENCE Vol. XXVI, 1919 



Page 

 Supplemental List of Plants from Southeastern Alaska. J. P. An- 

 derson 327 



Measurements of Wood Fibre. Henry S. Conard and Wilbur A. 



Thomas 333 



Check-list of the Plants of Grinnell. Henry S. Conard and Frank E. 



A. Thone 



Study of a Section of the Oregon Coast Flora. Morton E. Peck 337 



Hybridization in Iris. M. Louise Sawyer 363 



Studies upon the Absorption and Germination of Wheat Treated with 

 Formaldehyde. A. L. Bakke and H. H. Plagge 365 



Chemistry. 

 Some American Dolomites. Burleigh B. Reed and Nicholas Knight... 377 



Geology. 



Meteor Mountain. David H. Boot 379 



Possible Errors in Pleistocene Field Observations. B. Shimek 



Helicina occulta Say. B. Shimek 385 



A Problem in Municipal Waterworks for a Small City. John L. Tilton 



A Note on Conditions at the Head of Flood Plains. John L. Tilton 391 



New Features with Reference to the Thurman-Wilson Fault. John 



L. Tilton 



Exhibit of Pictures of the Tornado which passed through Eastern Ne- 

 braska, April 6, 1919. John L. Tilton 



The Relation of the Satsop Flora to the Youngest Known Mountain 



Range in North America. Ralph W. Chaney 



The Interpretation of Certain Leached Gravel Deposits in Louisa and 



Washington Counties, Iowa. Walter H. Schoewe 393 



The lowan-Wisconsin Drift Border. E. J. Cable 399 



The Deep Well at Laurens and Its Interpretation. E. J. Cable 405 



The Effect of Rivers on the Location of Iowa Cities. Alison E. 



Aitchison 



A Century of Iowa Geology. Charles Keyes 407 



Southward Extension of the Bozeman Tertiaries into Utah. Charles 

 Keyes 467 



Stratigraphic Delimitation of St. Louis Formation. Charles Keyes 471 



The Aftonian Gravels near Afton Junction — Are They Interglacial? 



George F. Kay 



Some Large Bowlders in Kansan Drift in Southern Iowa. George 



F. Kay 



An Illustration of the Wedge-work of Roots. A. O. Thomas 477 



The Ascent of Mount :\Iisery on the Island of St. Kitts, British West 



Indies. A. O. Thomas 



A Herpetocrinus from the Silurian of Iowa. A. O. Thomas 481 



The Independence Shale near Brandon, Iowa. A. 0. Thomas 485 



The History of Boyer Valley. James H. Lees 493 



Physics and Psychology. 

 Some Structural Features of Selenium Deposited by Condensation 

 from the Vapor State Above the Melting Point. L. E. Dodd 501 



