IOWA ACADEMY OF SCIENCE 
TABLE OF CONTENTS 
Page 
Letter of Transmittal \[[ 
Officers of the Academy v 
Membership of the Academy vi 
Table of Contents x 
Report of the Secretary 1 
Amendment to the Constitution 3 
Treasurer’s Report 3 
Officers for the Year 1909-10 3 
Program 4 
Resolutions on Darwin - 5 
Necrology 7 
President’s Address, by Samuel Calvin. . 11 
The Polyporaceae of Payette, Iowa, by Guy West Wilson. 19 
Some Parasitic Polyporaceae, by Clarence D. Learn. 23 
The Underground Organs of a Pew Weeds, by L. H. Pammel and Estella D. 
Pogel 31 
Notes on Pactors in Pungus Diseases of Plants, by L. H. Pammel and 
Charlotte M. King 41 
The Plora of Iowa Rock, by R. B. Wylie 99' 
The Action of Manure on a Certain Soil, by E. B. Watson 103 
The Okoboji Lakeside Laboratory, by Thomas H. Macbride 131 
Some Peatures of Iowa Ground Water, II, by W. S. Hendrixson 135 
The Analysis of Smaltite with Special Reference to the Estimation of 
Arsenic and Cobalt, by Nicholas Knight 143 
The Pruit of Viburnum Nudum, by Robert H. Lott and Nicholas Knight. . 145 
Significance of Thrust-Planes in the Great Basin Ranges,^^by Charles R. Keyes 151 
Orotaxial Geologic Correlation and Diastrophism, by Charles R. Keyes.. 153 
Carbonic Column of Rio Grande Region, by Charles R. Keyes 159 
The Hysteresis Loop, by D. Y/. Morehouse and Harry Ray Woodrow 165 
The Googler Primary Battery, by Harry Ray Woodrow 167 
Effect of Temperature Inequalities on the Balance, by L. D. Weld 181 
Evaporation from Pfee Water Surfaces, by Arthur G. Smith 185 
The Pifth and Seventh Cranial Nerves in Plethodon Glutinosus, by PI. W. 
Norris 189 
The Relative Prequency of Arterio Sclerosis of the Various Arteries, by 
W. E. Sanders 193 
The Summer Resident Birds of Polk County, Iowa, by Lester P. Pagen. . . . 197 
The Migration of Nervous Elements into the Dorsal and Ventral Nerve- 
Roots of Embryos of the Pig, by Albert Kuntz 217 
Some Observations on the Embryology of Chironomus, by W. N. Craven. ... 221 
