TITLES OF PAPERS RECEIVED 
9 
Physics. 
Page 
Certain Features of Rheostat Design H. L. Dodge 183 
An Interesting case of Resonance in an Alternating Current 
Circuit H. L. Dodge 189 
The X-Ray K-Radiation of Tungsten.. Elmer Dershem 201 
The Absence of Relationship Between Electro-mechanical 
Properties of Selenium Crystals and Their Photo-Electric 
Emission by Ultra-Violet Light 
F. C. Brown and F. S. Yetter 
The Influence of Intensity Ratio in Binaural Sound Localiza- 
tion E. M. Berry and C. C. Bunch 203 
A Peculiar Electrically Conducting Layer on the Surface of 
Mica G. W. Stewart 
On the Torsional Elasticity of Drawn Tungsten Wires 
L. P. Sieg 207 
The Thermal Conductivity of Tellurium. . . .Arthur R. Fortsch. .... .213 
Electrical Capacity of Similar, Non-parallel Plane Plates and 
Its Application Where the Plates are Non-rectangular . . . . 
L. E. Dodd 217 
The Stroboscopic Effect L. E. Dodd 221 
Precontract Conduction Currents L. E. Dodd 231 
Effect of Drawing on the Density and Specific Resistance of 
Tungsten Wm. Schriever 235 
Effect of Gases on Unilateral Conductivety. .Robert B. Dodson 241 
Zoology and Allied Subjects. 
Birds of the Past Winter, 1916-1917, in Northwestern Iowa. . 
T. C. Stephens 245 
A List of the Birds Observed in Clay and O’Brien Counties, 
l'owa Ira N. Gabrielson. 259 
An Annotated List of the Mammals of Sac County, Iowa 
J. A. Spurrell 273 
Notes on Bell’s Vireo Walter Bennett 285 
An Analysis of the Cranial Ganglia of the Dogfish 
Sally P. Hughes 295 
The Eyeball and Associated Structures in the Blindworms.. 
H. W. Norris 299 
Bermuda as a Type Collecting Ground for Invertebrates 
H. A. Cross, Jr 301 
White Grub Outbreaks in Northeastern Iowa..R. L. Webster 
The Influence of the Male on Litter Size 
Edward N. Wentworth 305 
A List of Entomostraca from Lake Okoboji 
Frank A. Stromsten 309 
The Development of the Musk Gland in the Loggerhead Turtle 
Frank A. Stromsten 311 
Some New Endoparasites of the Snake Thestle T. Job 315 
Further notes on the Venous Connection of the Lymphatic 
System in the Common Rat. Thestle T. Job., 319 
Mites Affecting the Poison Oak H. E. Ewing 323 
The Odonata of Iowa Lloyd Wells 327 
Observations on the Protozoa, With Descriptions and Draw- 
ings of Some Probable New Species 
Clementina S. Spencer 335 
