INDEX 
277 
INDEX. 
Page. 
Bacteria in Des Moines School Buildings, An Observation on 21 
Bromic Acid on Metals, Action of 179 
Carotid Arteries and their relation to the Circle of Willis in the Cat 251 
Chemistry, Periodical Literature in Iowa on the Subject of 175 
Choroid Plexus, (abstract), A Study of the 245 
Cladocera of Des Moines and Vicinity 267 
Collembolan Eye, Studies of the 239 
Corinth Canal Zone (abstract). Geology of the 195 
Cyclonic Distribution of Precipitation 223 
Discomycete Flora of Iowa, Notes on the 71 
Diseases of Rocky Mountain Plants 89 
Disparity between Age and Development in the Human Family, Illustrated 
by Pronounced Cases due to Thyroid Malformation 257 
Dolomite and Magnesite with Reference to the Separation of Calcium and 
Magnesium 167 
Doppler Effect in Sound, A Simple Demonstration of the 229 
Effect of Pressure upon Lines in the Spectrum of Iron 231 
Electrical Standards 233 
Flora of Webster County, Iowa 25 
Floristic Notes from an Illinois Esker 59 
Flowering Plants of Calcasieu Parish, Louisiana, Some of the 161 
Forest Trees of Eastern Nebraska 75 
Fossil Fauna, Alternation of 199 
Iowa Geology, Some Variant Conclusions in 183 
Iowan Drift Border in Fayette County, Iowa, A study of a portion of 215 
Lichens and Recent Conceptions of Species 65 
Lime Creek Fauna of Iowa in Southwestean United States and Northern 
Mexican Region 197 
Logarithmic Factors for Use in Water Analysis 173 
Madison County Geology, A Contribution to 203 
Missouri River Loess, More Light on the Origin of 187 
Motor Nerve Endings, Relation of, to Voluntary Muscle in the Frog 261 
Municipal Hygiene, Part II— Milk . 17 
Mutual Induction and the Internal Resistance of a Voltaic Cell 219 
Photographic Accessories of the Drake Observatory 15 
Physical Laboratory at Iowa College .. 227 
Presidential Address 7 
Sand Dunes and Sand Wastes, The Holding and Reclamation of, by Tree 
Planting .... 209 
Subterranean Crustacea, Food of 273 
Tides and Tidal Action, An Attempt to Illustrate 207 
