666 INDEX 



Vol. Page 

 Photo-electrons, See Silver. 



Phthalate, Acid Potassium, as a Standard in Volumetric 



Analysis, W. S. Hendrixson XXV, 501 



Phthalates, Acid Potassium and Acid Sodium, as Stand- 

 ards in Alkalimetry and Acidimetry, W. S. Hen- 

 drixson XXII, 217 



Physics, Recent Progress in, Presidential Address, 1917, 



G. W. Stewart XXIV, 29 



Relation of, to Other Material Sciences, A. A. Veblen, 



Presidential Address, 1901 -. IX. 21 



in Iowa in Quarter Century, F. F. Almy XIX, 73 



See Laboratory. 

 Piatigorsk, See Necks. 



Picea from Glacial Drift, W. A. Thomas XXIV, 455 



Pig, Chromaffin Cells of Adrenals of, Mildred Yule XIX, 215 



Migration of Nervous Elements in Embryos, A. Kuntz XVI, 217 

 Pine Creek Conglomerate, See Conglomerate. 



Pinnepedia, Polygamy among, C. C. Nutting I, II, 96 



Pipes, Hot Water, Why They Burst More Frequently than 



Cold Water Pipes, F. C. Brown and W. Noll XXIII, 237 



Pistils, See Apples. 



Pits, Cherry, Oil in, H. L. Maxwell and N. Knight XXIV, 451 



Place, B. A., Relation of the Motor Nerve Endings to 



Voluntary Muscle in the Frog XIII, 261 



Plaisance, G. P., See Dox and Plaisance. 

 Planes, Parallel Conducting, Measuring Distances Be- 

 tween, P. C. Brown XX, 271 



Plant Studies in Lyon County, D. H. Boot XXIV, 393 



Plants, Aquatic, from Northern Iowa, B. Shimek IV, 77 



Diseases of, at Ames, 1S94, L. H. Pammel II, 201 



Flowering, of Adair County, J. E. Gow VIII, 152 



of Hardin County, M. E. Peck XII, 193 



of Henry County, J. M. Lindly XII, 157 



of Louisiana, Calcasieu Parish, J. M. Lindly XIII, 161 



of Madison County, H. A. Mueller XI, 261 



Higher, General Classification of, H. S. Conard XXV, 237 



Introduced, L. H. Pammel IV, 1 10 



Living, as Geological Factors, B. Shimek. X, 41 



New or Little Known, T. J. Fitzpatrick IV, 108 



Nutrient Solution for, See Iron. 



Pioneer, See Levee. 



Poisonous, of Iowa, L. H. Pammel and E. D. Vogel .... XIV, 147 



Prairie, Ecological Histology of, Ella Shimek XXII, 121 



Relation of Frost to Certain, L. H. Pammel I, ///. 77 



Spring Flowering, of Henry County, Phenological 



Records of, H. E. Jaques XXV, 413 



Woody, of Western Wisconsin, L. H. Pammel I. 77. 76 



Sec- Alaska, Clear Creek Canon, Diseases, Embryology. 

 Plateau-plains, Arid, as Features of Folic Erosion, C. R. 



Keyes XIX, 157 



