IOWA ACADEMY OF SCIENCE ix 
TABLE OF CONTENTS 
Page. 
Reports 1 
Necrology 6 7 
Necrology 1 
The Influence of Air Currents on Transpiration 13 
'^Prairie Openings in the Forest 16 
'^Delayed Germination 20 
The Problem of Weeds in the West 34 
'^Preliminary List of the Parasitic Fungi of Fayette County, Iowa 47 
^The Staminate Flowers of Elodea 80 
Spore Formation in Lycogala Exiguum, Morg 83 
^ Early Historico-Botanical Records of the Oenotheras 85 
The Digestibility of Bleached Flour 125 
The Effect of Continued Grinding on Water of Crystallization 131 
A Study in the Determination of Calcium 135 
Points Regarding the Casing of Well (4) at Grinnell 139 
Studies in the Solubility of Portland Cement Continued from 1908 143 
Some Geological Aspects of Artiflcial Drainage in Iowa 151 
\/ Pleistocene Record of the Simpson College Well 159 
Maxwell Coulee and the Diversion of the Rio Mora 165 
Distribution of Bonanzas in the Pachuca Silver District of Mexico 167 
Theory of Meteoric Agglomeration and the Ultimate Source of the Ores 169 
'/The Aftonian Age of the Aftonian Mammalian Fauna 177 
Concerning a Study of Kerosene Oils by Physical Methods 181 
Some Recent Discoveries Concerning the Behavior of Platinum-Iridium Wires. 185 
Standardizing Tests of Stern’s Tone Variator 195 
/ Contributions to the Herpetology of Iowa 198 
'^An Annotated Catalogue of the Recent Mammals of Iowa 211 
'^The Development of the Sympathetic Nervous System in Birds 219 
'^The Cranial Nerves of Siren Lacertina 223 
'^The Development of the Posterior Lymph Hearts of the Loggerhead Turtle. 227 
Historical Sketch of Early Health Regulations in Iowa 229 
