INDEX 
319 
P 
Pammel, E. H., Memorial of E. W. Stanton 29 
Pammel, E. H., The Teaching of Plant Pathology 263 
Pammel, E. H., Trees of the Proposed Mississippi Valley National 
Park 265 
Pammel, E. H., Shrubs of the McGregor District 268 
Pammel, E. H., and King, C. M., Studies in the Germination of Some 
Woody Plants 273 
Parasitology, Methods of Teaching, Herbert R. Werner.. 215 
Park, See Mississippi Valley Park. 
Pathology, See Plant Pathology. 
Patterson, T. E., The Readjustment of the Peripheral Eung Motor 
Mechanism after Bilateral Vagotomy 207 
Pendulum, See Rater’s Pendulum. 
Photographic Plate, Blackening of, P. S., Helmick 119 
Phycomycetes of Iowa, Studies of, J. M. Raeder 283 
Pigs, Growing and Fattening, Corn Oil Cake Meal for, John M. 
Evvard and Russell Dunn 135 
Plant Pathology, Teaching of, E. H. Pammel 263 
Plants, Woody, Germination of Some, E. H. Pammel and C. M. King 273 
Plants, Flowering, of Central Iowa, Key to Families of, H. S. Conard 
and Winifred Ellsworth 305 
Plants, See Common Names: Gmelin. 
Pleistocene. Exposures in Des Moines, James H. Eees 59 
President, Address of: American Science, Nicholas Knight 33 
Proboscidean Remains found in Henry County, H. E. Jaques 65 
Pyrometer, Eaboratory Optical : Notes on its Design and Operation, 
Wm. Schriever 69 
R 
Raeder, J. M., Studies in Phycomycetes of Iowa 283 
S 
Schriever, Wm., A Eaboratory Optical Pyrometer: Notes on its 
Design and Operation 69 
Selenium, Hexagonal Crystals of, Coefficient of Simple Rigidity and 
Young’s Modulus for, E. P. Sieg and R. F. Miller 103 
Shimek, B., The Use of Common Names for Plants 225 
Shimek, B., The "Genus Ceanothus. E. in Iowa 230 
Shrubs, See McGregor. 
Sieg, E. P., Effect of Drawing on Crystal Structure of Tungsten Wires 95 
Sieg, E. P., A Note on Rater’s Reversible Pendulum 98 
Sieg, E. P., and Fant, A. T., The Absorption of Eight Passing Through 
Deep Slits 112 
Sieg, E. P., and Miller, R. F., The Coefficient of Simple Rigidity and 
Young’s Modulus for Hexagonal Crystals of Selenium 103 
Sierra de los Cucaras, See Baja California. 
Silver Films, Thin, Hall Effect in, J. C. Steinberg 115 
Slits, Deep, Absorption of Eight Passing Through, E. P. Sieg and 
A. T. Fant 112 
Solar Surface During Past Thirteen Years, David E. Hadden 121 
Sound, See Tones. 
Smith, John E., Three Glacial Tills at Ames 47 
Smooth Muscle Responses, Analysis of, B. M. Harrison and F. ‘M. 
Baldwin 179 
Stanton, E. W., Memorial of, E. H. Pammel 29 
Steinberg, J. C., Hall Effect in Thin Silver Films 115 
Stewart, G. W., A Single Band Acoustic Wave Filter 93 
Stoner, Dayton, Bird Banding and Incidental Studies 151 
Stroboscopy, Tactual Analog of, E. E. Dodd 113 
Sun-Spots, See Solar Surface. 
