IOWA ACADEMY OF SCIENCE 
TABLE OF CONTENTS 
Page. 
Letter of Transmittal iii 
Officers of the Academy v 
Members of the Academy vi 
Table of Contents xi 
Report of the Secretary , 1 
Treasurer’s Report 2 
Report of Committee on Membership 3 
Report of Committee on Resolutions 4 
Constitution of Academy 6 
Program 8 
President’s Address 11 
Anniversary Address 17 
Charter Members of the Iowa Academy of Science 27 
Twenty-five Years of Botany in Iowa 43 
History of Geology in Iowa for the Last Twenty-five Years 65 
The Progress of Physics in Iowa in the Quarter Century 73 
The Progress of Zoology in Iowa During the Last Twenty-five Years 79 
Greetings from Visiting Academies 85 
The Late Blight of Barley 93 
Simblum Sphaerocephalum in Iowa 103 
Perns and Liverworts of Grinnell and Vicinity 105 
Secotium Agaricoides, A Stalked Puffball 107 
Behavior of Pollen Tubes in Richardia Africana 109 
An Anomalous Ovary Ill 
Native Dye-plants and Tan-plants of Iowa, With Notes on a few other 
Species 113 
Some Points on the Floral Development of Red Clover 129 
Notes on Heteranthera Dubia 131 
The Effect of Continued Grinding on Water of Crystallization 133 
Velocity Coefficients of the Reaction Between Ethyl Iodide and Silver 
Nitrate in Ethyl and Methyl Alcohol and Mixtures of These Solvents ... 137 
Sundry Provincial and Local Phases of the General Geologic Section of 
Iowa 1,147 
Nether Delimitation of Our Carbonic Rocks 153 
Arid Plateau-Plains as Features of Eolic Erosion 157 
The First Reported Petrified American Lepidostrobus is from Warren 
County, Iowa 163 
The Salem Limestone and its Stratigraphic Relations in Southeastern Iowa. 167 
The Origin of the Geodes of the Keokuk Beds 169 
