TITLES OF PAPERS PRESENTED 
, Page 
Presentation of the Calvin Memorial Portrait. 
Address of President Macbride 23 
Address of Doctor Pammel 27 
Address of Professor Arey 29 
Address of Professor Shimek 29 
Address of Professor Thomas 31 
Address of Curator Harlan 32 
The Address of the President : The Taxonomic Unit. T. C. Stephens 41 
Botany 
The Treatment of Certain Seed Carried Diseases. Guy West Wilson 
Some Noteworthy Uredinales and Ustilaginales. Guy West Wilson.. 
Notes on Apogamous Liguliflorae. Raymond A. French 
Some Aspects of the Plant Ecology of Certain Kansas Sand Hills. 
Fred W. Emerson 
Notes on Some Rocky Mountain Plants, Chiefly of the Arapahoe 
Mountains. L. H. Pammel and R. I. Cratty 51 
Further Notes on the Germination of Some Trees and Shrubs and 
their Juvenile Forms. L. H. Pammel and Charlotte M. King 75 
On the Occurrence of the Giant Puff Ball. Harry M. Kelly 
The Disintegration of Certain Intracellular Bodies. Clifford H. Farr. 
The Teaching of Plant Pathology. W. H. Davis 81 
Plant Tumors. Henry Albert 
The Vegetation of Cape Blanco. Morton E. Peck 85 
The Major Vegetation of Lake Okoboji. Robert B. Wylie 91 
Some Alaska Fungi. J. P. Anderson 99 
The Genus Ceanothus in Iowa. B. Shimek 
Querciis lyrata Walter in Iowa. B. Shimek 
Seasonal Variations in their Relation to Ecological Field Observations. 
B. Shimek 
Notes on the Distribution of Midsummer Bee Plants in the Mississippi 
Zone of Clayton County. Ada Hayden 109 
The Growth of Foliage Leaves. Beryl Taylor 
Comparison of the Absorption Occurring in Corn Stalk Tissue and 
in Prepared Biocolloids. L. E. Yocum and A. L. Bakke 123 
Mechanical Penetration of Sweet Corn Pericarp. R. A. Rudnick and 
A. L. Bakke 129 
The Downy Brome Grass in Iowa. H. E. Jaques 133 
