374 
IOWA ACADEMY OF SCIENCE Voi,. XXIX, 1922 
Crop Production, See Weeds. 
Cucurbit Mosaic, See Mosaic, Cucurbit. 
Cucurbita, Description and Key to the Genus, Fred C. Werkenthin 281 
Cucurbitaceas, See Mosaic. 
D 
Dandelion, Red-seeded and Common, A Comparative Study of, June 
Berry ....313 
Davis, George E., Coefficients of Diffusion of Salt Vapors in the 
Bunsen Flame 155 
Development, Chance in, See Variation. 
Diffusion, See Salt Vapors. 
Diplodia zeae, See Corn. 
Dolomites from the Austrian Tyrol and Other Eocalities, Nicholas 
Knight 349 
Drum Records, See Fatigue. 
Durrell, E. W., The Nodal Infection of Corn by Diplodia zeae ...... 346 
E 
Earthworm, See Muscle Responses. 
Easter Lily, See Lily, Easter. 
Electrometric, See Sulfurous Acid and Titanous Solutions. 
Electron, Rigid, Path of, E. O. Hulburt 147 
Ellsworth, Winifred, Parry’s Catalog of Iowa Plants of 1848. ....... 339 
Elmer, O. H., Studies of Insect Transmission and Cross-inoculation 
of Mosaic on the Solanacese, Cucurbitacese and Leguminosae 311 
Emerson, Paul, A Chemical Classification of the Activities of Soil 
Microorganisms 355 
Empoasca flavescens, Notes on, R. L. Webster 195 
Evergreens, See Gymnosperms. 
Eurypterid, An Iowa Cambrian, O. T. Walter 127 
Ewing, H. E., Notes on Some of the Rarer Birds of the Ames Region 211 
F 
Fatigue, Simultaneous Fast and Slow Drum Records of, F. M. Baldwin 199 
Faults, See Horizontal Movement. 
Fenton, Carroll Lane and Mildred Adams, Some Black River Brachio- 
pods from the Mississippi Valley 67 
Fenton, F. A., See Goodwin and Fenton. 
Ferns and “Fern-allies” of Grinnell and Vicinity, a Manual of, Henry 
S. Conard 317 
Fillman, Louise, Origin of Limestone Conglomerates.... 128 
Fillman, Louise, Classification of Lenses 128 
Fulmer, Ellis I., and Nelson, V. E., Studies on Yeast. V-Is Bios a 
Single Substance? 371 
Fort Dodge Beds, Structure of, James H. Lees 113 
Fulmer, E. I., See Nelson Fulmer and Heller. 
Fungicides, See Mercuric Chloride. 
G 
Galpin, S. L., The Rockford Geodes 128 
