406 
IOWA ACADEMY OF SCIENCE 
Selenium Crystal, Attempt to Detect Change in Heat Conductivity of, 
with Change in Illumination, L. P, Sieg 329 
Shore-Lines, Contraposed, on Straits of Juan du Fuca, Charles Keyes. . . . 272 
Snakes “Swallowing” Their Young, E. D. Ball 343 
Ste. Genevieve Formation and Its Stratigraphic Relations in Southeast- 
ern Iowa, Stuart Weller and Francis M. Van Tuyl 241 
Swine, Appetite of. Is it a Reliable Indication of Physiological Needs? 
John M. Evvard 375 
Syndactylism, Inheritance of, Henry Albert 17 
Tellurium Crystals, Production and Some Electrical Properties of, W. 
E. Tisdale 303 
Tempered Scale, Simple Device for Demonstrating, L. B. Spinney. ..... . 327 
Terrace South of Des Moines, Age of, John L. Tilton 233 
Upper Carboniferous of Iowa, Paleontology and Stratigraphy of, George 
L. Smith 273 
Vocational Guidance, Psychogram in, Carl E. Seashore..... 341 
Weeds of Central Iowa, Northern Minnesota and Wisconsin, Comparative 
Study of, L. H. Pammel. . '. 57 
Wisconsin Drift, Extension of. Southwest from Des Moines, John L. 
Tilton 229 
