SUBJECT INDEX 
Page 
Alsike Clover Rust, Aecial Stage of, !W. H. Davis 461 
Amino Acids and Micro-Organisms, Arthur W. Dox 530 
Amino Group, Action of, on Amylolitic Enzymes, Elbert W. 
Rockwood 551 
Apple Skins, Cutinization of, in Relation to Keeping Qualities and 
Environment, Winifred Perry 483 
Bell’s Vireo Studies, Walter W. Bennett 285 
Benzidine, Behaviour of, Toward Selenic and Telluric Acids, 
Arthur W. Dox . 537 
Bermudas as a Type Collecting Ground for Invertebrates, H. A. 
Cross, Jr 301 
Binaural Sound Localization, Influence of Intensity Ratio on, EL M. 
Berry and C. C. Bunch 203 
Bird Records During Past Winter, 1916-1917, in Northwestern Iowa, 
T. C. Stephens 245 
Birds Observed in Clay and O’Brien Counties, List of, Ira N. 
Gabriel son 259 
Blasia Pusilla, Morphology of Thallus and Cupules of, 
Marguerite B. Ron ret 429 
Blindworms, Eyeball and Associated Structures in, H. W. Norris.. 299 
Buchanan Gravels of Calvin and Iowan Valley Trains, M. M. 
Leighton 86 
Cap-Au-Gres Fault, Extent and Age of, Charles Keyes 61 
Conduction Currents, Precontact, L. E. Dodd 231 
Conservation, Geologic Aspects of, James H. Lees ...133 
Coral, Fossil, Large Colony of, A. O. Thomas ...105 
Corn, Chlorotic, W. H. Davis 459 
Crustacean, Decapod, from Kinderhook Shale at Burlington, Otto 
Walter 119 
Driftless Area, Bibliography of, W. D. Shipton 67 
Earth History, Fundamental Concepts of, James H. Lees 155 
Earthquake near Iowa City, April 9, 1917, Note regarding, George 
F. Kay 103 
Entomostraca, List of, from Okoboji Region, Frank A. Stromsten. 309 
Fruit or Nut, Supposed, from Tertiary of Alaska, A. O. Thomas. .. 113 
Iowa Weeds, Protein Content and Microchemical Tests of Seeds 
of, L. H. Pammel and Arthur W. Dox . 527 
Iowan Glaciation and So-called Iowan Loess Deposits, M. M. 
Leighton 87 
Iron in Nutrient Solution for Plants, use of, G. E. Corson and A. L. 
Bakke 477 
