8 IOWA ACADEMY OF SCIENCE 



PAGE 



An Outlier of the Clinton Formation in Dubuque County.... 



J. V. Howell 121 



A Correlation of Peneplains in the Driftless Area 



Urban B. Hughes 125 



New Exposures Showing Superimposition of Kansan Drift on 



Sub-Aftonian Drift in eastern Iowa M. M. Leighton 133 



A Note on Fulgurites from Sparta. Wisconsin. .W. D. Shipton 141 



A New Stratigraphic Horizon in the Cambrian System of 



Wisconsin W. D. Shipton 142 



The Loess of Crowley's Ridge, Arkansas B. Shimek 147 



Bibliography of the Loess E. J. Cable . . . .159 



The Lithogenesis of the Sediments F. M. Van Tuyl 163 



The Western Interior Geosyncline and Its Bearing on the 



Origin and Distribution of the Coal Measures 



F. M. Van Tuyl 166 



Pleistocene Exposures on Capitol. Hill James H. Lees ... .167 



Some Xew Xiagaran Corals from Monticello, Iowa 



A. 0. Thomas 



A Highly Alate Specimen of Atrypa reticularis (Linne) 



A. 0. Thomas 173 



Certain Conclusions in Regard to Audition G. W. Stewart 



The Effect of Temperature upon the Elasticity of Tungsten.. 



H. L. Dodge 



On the Variation of the Reflecting Power of Isolated Crystals 

 of Selenium and of Tellurium with the Azimuth of the 



Incident Folarized Light L. P. Sieg . . . .179 



A Physical Representation of the Summation of Certain Types 



of Series L. P. Sieg 1S7 



The Tungsten X-Ray Spectrum Elmer Dershem .... 191 



A Curve of Moisture Condensation on Glass Wool. .L. E. Dodd 195 



The Stroboscopie Effect by Direct Reflection of Light from 



Vibrating Membranes L. E. Dodd 199 



A Xew Tonoscope L. E. Dodd 204 



An Electrical Apparatus for Securing and Maintaining Con- 

 stant High Temperatures W. E. Tisdale 209 



A Study of Some of the Torsional Elastic Properties of 



Phosphor-Bronze Wires A. J. Oehler .... 213 



A new Method of Identification of Polarized Light Reflected 



from Small Opaque Crystals LeRoy D. Weld 235 



Why Hot-Water Pipes in Household Plumbing Burst More 



Frequently than Cold Water Pipes 



F. C. Brown and Waldemar Xoll 237 



A Bibliography of the Literature Bearing on the Light Sensi- 

 tiveness of Selenium F. C. Brown 241 



A Sheep's Brain Without a Corpus Callosum; a Demonstra- 

 tion H. A. Scullen 265 



Recent Theories of Heredity in Relation to the Theory of 

 Xatural Selection C. C. Xutting 



