TITLE'S OF PAPERS PRESENTED 9 



Page 

 Notes on the Food of the Yellow Perch in Cayuga Lake. ..... 



W. A. Hoffman 213 



The Cranial Nerves of the Dogfish Sally P. Hughes . 



Spiders of the Family Attidge Collected in the Vicinity of 



Ames I. L. Ressler 221 



Bota7iy. 



The White Waterlily of McGregor, Iowa Henry S. Conard 235 



The Classification of Plants Henry S. Conard 237 



An Unusual Black Walnut L. H. Pammel 241 



An Annual Sweet Clover L. H. Pammel 249 



Notes on the Perennial Mycelium of a Few Parasitic Fungi 



L. H. Pammel 259 



A Study of the Formation and Development of the Flower 

 Buds of Jonathan and Grimes Golden in Relation to Dif- 

 ferent Types of Soil Management R. S. Kirby 285 



An Ecological Study of the Weeds of Some Iowa Fields 



R. S. Kirby 



The Germination of Some Native Iowa and Exotic Tree Seeds 



L. H. Pammel and Charlotte M. King 291 



The Vegetative Organs of Some Perennial Grasses 



Florence Willey 341 



Some Anatomical Notes on the Plants of a Prairie Province 



Ada Hayden 369 



The Pollen and Pistil in Relation to the Germination of the 



Pollen in Five Varieties of Apples John N. Martin 391 



The Structure of the Seed Coat and Its Relation to the Germina- 

 tion of the Seeds of the Two Common Sweet Clovers 



John N. Martin 



Cytological Study of the Abortion of the Pollen in the Winesap 



John N. Martin 



The Endosperm of Utricularia 



Robert B. Wylie and Alice Yocom 



A Miniature Vallisneria Robert B. Wylie 



Notes on an Introduced Woodland Flora R. I. Cratty 411 



A Study in Cereal Roots R. O. Westley and A. L. Bakke 



Some Phenological Records of Spring Flowering Plants of 



Henry County H. E. Jaques 413 



The Fern Flora of Northeastern Iowa T. J. Fitzpatrick 417 



Pioneer Plants on a New Levee IV Frank E. A. Thone 423 



Eradication of the Barberry in the Spring Wheat Sections of 



the United States with Special Reference to Iowa 



I. E. Melhus 



Plants of Southeastern Alaska J. P. Anderson 427 



Chemistry and Agricultural Chemistry . 



Ames and Iowa Sections American Chemical Society. 

 Iowa Chemists and the War. A Discussion. Leaders: E. W. 

 Rockwood, Iowa Section, and W. F. Coover, Ames Section 



