634 INDEX 



Vol. Page 

 Drew, Oilman, Some Reasons Why Frogs are able to Sur- 

 vive • I, III, 32 



The Anatomy of Sphaenum siilcaUim Lam Ill, 173 



Drift Border, lowan, in Fayette County, G. E. Finch XIII, 215 



Exposure in Tama County, T. E. Savage VIII, 275 



lowan and Kansan (?) East of West Line of Drift- 

 less Area, E. Orr XIV, 231 



Kansan, on Sub-Aftonian Drift, M. M. Leighton XXIII, 133 



Nebraskan, of Little Sioux Valley, J. E. Carman XX, 231 



Of Iowa, Gas, in, A. G. Leonard IV, 41 



Problem, lowan. Status of, G. F. Kay XXIII, 75 



Section, See Oelwein. 



South Dakota, J. E. Todd VI, 122 



Wisconsin, in Polk County, J. L. Tilton XXI, 219 



Relation of, to lowan Drift in Worth County, E. J. 



Cable XXV, 539 



Southwest of Des Moines, J. L. Tilton XXII, 229 



See, Picea, Stones. 



Driftless Area, Bibliography of, W. D. Shipton XXIV, 67 



Peneplains of, U. B. Hughes XXIII, 125 



See Drift. 



Drifts, Pleistocene, Leaching of, M. M. Leighton XXII, 19 



Dubuque, See Lansing, Lead and Zinc, Satin Spar. 



Dubuque County, See Clinton. 



Duck Hawk (Falco peregrinus anatum) in Iowa, B. H. 



Bailey X, 93 



Ductus Venosus, See Cat. 



Dudgeon, Winfield, A Study of the Variation of the Num- 

 ber of Ray Flowers of Certain Compositse XIV, 89 



Dunes, Sand, Reclamation of, H. P. Baker XIII, 209 



Durrell, L. W., Notes on Some North American Conifers 



Based on Leaf Characters XXIII, 519 



Dust, Volcanic, from Omaha, Nebraska, J. E. Todd I,//, 16 



Dye-plants and Tan-plants of Iowa, H. S. Kellogg XIX, 113 



E. 

 Ear, Amphibian, Morphology and Function of, H. W. 



Norris VIII, 76 



Cyclostome, Homologies of, H. W. Norris Ill, 29 



Earth History, Fundamental Concepts of, J. H. Lees XXIV, 155 



Movements and Drainage Lines in Iowa, J. H. Lees.. XXI, 113 



Earthquake at Iowa City, April 9, 1917, G. F. Kay XXIV, 103 



Eberly, C. F., See Cook and Eberly. 



Echinoids, American Paleozoic, C. R. Keyes II, 178 



Eckles, C. H., An Abnormal Fermentation of Bread VII, 165 



A Comparison of Media for the Quantitative Estima- 

 tion of Bacteria in Milk VIII, 139 



A Method of Isolating and Counting Gas Producing 



Bacteria in Milk VIII, 144 



Eclipse, Total Solar, of May 28, 1900, D. E. Haddeu VIII, 145 



