IOWA ACADEMY OF SCIENCE 339 
INDEX 
' Page 
Aperture of a Telescope and the Quality of the Image Obtained by It, 
an Experimental Investigation of the Relation Between 283 
Araceae, Phylogeny of 161 
Birds, Helpful and Harmful Iowa 295 
Brown Thrasher, a Further Study of the Home Life of 299 
Contents x 
Devonic Sequences, Late, of the Iowa Region 205 
Declinous Flowers of Iva Ganthifolia 151 
Electrical Method, Practical, of Measuring Distances Between Parallel Con- 
ducting Planes, with Application to the Question of the Existence of 
Electron Atmospheres . . . 271 
Electrical Properties, Similarity of, in Light-Positive Selenium to Those 
in Certain Crystal Contacts 261 
Fat Factors, Segregation of, in Milk Production... 195 
Fetal Development, Some Factors Affecting 325 
Flora of Johnson County, Iowa, Notes on 27 
Geological Name “Bethany,” the Proper Use of 207 
Grasses of Uintah Mountains and Adjacent Regions 133 
Inheritance, Color, in the Horse 317 
Iowan Cretacic Terranes, Complete Succession of 199 
Letter of Transmittal iii 
“Loess,” So-Called, of Southwest Iowa, Preliminary Note on 221 
Mammal Notes, Additional 311 
Members of the Academy vi 
Minimum Volume in Solution, on the Existence of 289 
Monterey Conifers 19 
Mounds and Mound Explorations in Northeastern Iowa 257 
Nebraska Drift, Notes on, of the Little Sioux Valley in Cherokee County. . 231 
Nitrogen in Rain and Snow 189 
Officers of the Academy v 
Parasitic Fungi, Partial List of, of Decatur County, Iowa 115 
Pleistocene Section from Des Moines South to Allerton 213 
Plum Curculio in Iowa, Life History Notes on 313 
Pollution of Underground Waters with Sewage Through Fissures in Rocks 7 
Post-Kansan Glaciation, Additional Evidences of, in Johnson County, 
Iowa 251 
Program ; * 4 
Rayleigh Disk, the Use of, in Determination of Relative Sound Intensities 279 
Report of Committee on Membership 3 
Report of the Secretary 1 
Report of the Treasurer 2 
Sedges of Henry County 103 
Siren Lacertina, Certain Points on the Anatomy of 291 
Skunk, Food Habits of 307 
Smoke and Gases, Effect of, on Vegetation 169 
Solomon’s Quarries, Rock from 193 
Tertiaric Age in Our State, Recognition of Beds of 203 
Urticaria Factitia, a Case of, Observed in the Coe College Psychological 
Laboratory 331 
Western Washington, Tramping in 11 
Wisconsin Drift Plain in the Region About Sioux Falls 237 
Woodpeckers, Nest Boxes for 305 
