TITLES OF PAPERS PRESENTED 



Page 

 The Address of the President: Some Problems in Conservation. S. 

 W. Beyer 37 



Zoology and Allied Subjects. 



The Birds of Marshall County, II. Ira N. Gabrielson 47 



The Resistance of Streptococci to Germicidal Agents. Henry Albert.... 77 



The Correlation of Art and Science in the Museum. Homer R. Dill 85 



Variations In the Branches of the Coeliac Artery in the Rabbit. H. 



R. Werner 93 



Variations in the Carotid Artery of the Rabbit. Francis Marsh 



Baldwin 103 



An Ecological Survey of Dry Run, a Small Prairie Stream. I. The 



Fishes. E. L. Palmer Ill 



Animal Tracks, Food and Disposition: Is There Any Relation? E. 



L. Palmer 125 



Some Zoological Notes from the Barbados — Antigua Expedition. C. 



C. Nutting 



Some Interesting Insect Habitats in the Tropics. Dayton Stoner 129 



Grass-hopper Control in Iowa. H. E. Jaques 133 



Notes on the Cercopidae with Descriptions of New Species. E. D. 



Ball 143 



Thomisidae of the Ames Region. Ivan L. Ressler 151 



Notes on the Occurrence of Warts on Cotton Tail Rabbits in Iowa. 



J. E. Guthrie 157 



Medical Work in the War. D. J. Glomset 



Botany. 



The Distribution of Grasses of Iowa, Wisconsin, Minnesota and the 



Dakotas with Reference to Rust. L. H. Pammel 163 



The Barberry in Iowa and Adjacent States. L. H. Pammel 193 



The Genus Lactuea in Iowa. R. I. Cratty 239 



The Rust on Mammoth Clover. W. H. Davis 249 



The Moss and Lichen Flora of Western Emmet County. B. O. Wolden 259 



The Flora of Mitchell County. Mrs. Flora May Tuttle 269 



A Naturalist's Glimpse of the Liraberlost. Mrs. Flora May Tuttle 301 



Seed Formation in Utricularia. Robert B. Wylie and Alice E. Yocom 



Notes on New or Rare Iowa Trees. B. Shimek 



The Genus Ceanothus in Iowa. B. Shimek 



Rosa pratincola Greene in Iowa. Evelyn Ensign 303 



The Fern Flora of Nebraska. T. J. Fitzpatrick 311 



