318 
IOWA ACADEMY OF SCIENCE Vor,. XXVIII, 1921 
G 
Gabrielson, Ira N., Notes on the Mammals Observed in Marshall 
County 147 
Gambusia, Differential Viability in, S. W. Geiser 197 
Geiser, S. W., Notes on the Differential Viability of Gambusia 197 
Germination, See Plants, Woody. 
Gilmore, Katherine, and Jaques, H. E., A Baltimore Oriole Census.. 131 
Glacial Tills, See Tills. 
Gmelin, Dr. Rudolph, and His Collection of Minnesota, Wisconsin and 
Iowa Plants, R. I. C ratty 247 
H 
Helmick, P. S., The Blackening of a Photographic Plate 119 
Henry County, See Proboscidean Remains. 
Hewlett Tone Generator, Measurements of Amplitude of Vibration 
of Diaphragm of, C. E. Lane 83 
Hadden, David E., The Solar Surface During the Past Thirteen Years 121 
Hall Effect, See Silver Films. 
Harrison, B. M., and Baldwin, F. M., Analysis of Certain Smooth 
Muscle Responses 179 
Hartzell, Albert, Distribution of the European Elm Scale 201 
J 
Jaques, H. E., Some Proboscidean Remains Found in Henry County.. 65 
Jaques, H. E., The 1921 Outbreak of the Clover-Leaf Weevil in Iowa. . 127 
Jaques and Gilmore, See Gilmore and Jaques. 
K 
Kater’s Reversible Pendulum, Note on, L. P. Sieg 98 
Keyes, Charles, Discovery of Volcanic Ash in Iowa 49 
Keyes, Charles, Geological Age of Terrepleins of Utah's Plateaux, ... 54 
Keyes, Charles, Batholithic Veinings of the Sierra de los Cucaras in 
Baja California 57 
King, C. M., See Pammel and King. 
Knight, Nicholas, American Science: Address of the President.... 33 
Knight, Nicholas, A Chemical Study of Dolomites 37 
L 
Lane, C. E., Measurements of Amplitude of Vibration of Diaphragm 
of Hewlett Tone Generator 83 
Lane, C. E., Measurements of Minimum Audible Intensity of Sound 
for Tones of High Frequency ; 89 
Leaves, Foliage, Capacity of, to Withstand Wounding, Robert B. 
Wylie 293 
Lees, James H., Some Pleistocene Exposures in Des Moines 59 
Light, See Slits: Photographic Plate. 
Lung Motor Mechanism, Peripheral, Readjustment of, after Bilateral 
Vagotomy, T. L. Patterson 207 
M 
Mammals Observed in Marshall County, Ira N. Gabrielson 147 
McGregor District, Shrubs of,,L. H. Pammel 268 
Miller, R. F., See Sieg and Miller., 
Mississippi Valley National Park, Proposed, Trees of, L. H. Pammel 265 
Monochromatic Light, See Photographic Plate. 
Muscle, See Smooth Muscle. 
N 
Names for Plants, See Common Names. 
Oriole, See Baltimore Oriole. 
O 
