IOWA ACADEMY OF SCIENCE 
PROGRAM (Continued) 
The Variation of the Resistance of Antimonite Cells with the Current 
Flowing, and the Probable Interpretation of This Variation. .F. C. Brown 
The Change of Young’s Modulus of a Soft Steel Wire with Electric Cur- 
rent and External Heating H. L. Dodge 
Are the Photo-Electric High Potentials Genuine. .. .Paul H. Dike and F. R. York 
Variation of Correspondence of Phase Relations and Sound Beats, the Two 
Sounds Being Presented One to Each Ear G. W. Stewart 
Some Dangers in Statistical Methods Arthur G. Smith 
The Problem of the Vision of an Illuminated Surface L. P. Sieg 
An Experimental Investigation of the Relation Between the Aperture of 
a Telescope and the Quality of the Image Obtained by It Fred Vorhies 
On the Existence of a Minimum Volume Solution LeRoy D. Weld 
Destruction of the Blue Bird by the Yellow Hammer Fred Berninghausen 
A Further Study of the Home Life of the Brown Thrasher, Toxostoma 
Rufum Linn Ira N. Gabrielson 
On Certain Points in the Anatomy of Siren Lacertina ..H. W. Norris 
The Food Habits of the Skunk Frank C. Pellett 
Nest Boxes for Woodpeckers Frank C. Pellett 
Life History Notes on the Plum Curculio in Iowa R. L. Webster 
Color Inheritance in Horses Edward Wentworth 
Some Factors in Foetal Development J. M. Evvard 
Additional Mammal Notes T. Van Hyning 
Appearance of a Case of Urticaria Factitia in the Coe College Psychologi- 
cal Laboratory Walter S. Newell 
