6 
IOWA ACADEMY OP iCIENCEO 
The following papers were presented before the Academy : 
Presidential address, “A Review of the development of Mineralogy”. — M. F, 
Arey. 
“The Carotid Arteries and Their Relation to the Circle of Willis in the Cat.”— 
H. W, Norris. 
“A Study of nolomlte and Magnesite with Special Reference to the Separa- 
tion of Calcium and Magnesium.” — N. Knight. 
“Ecological Notes from an Illinois Esker.” — Bruce Fink. 
“The Disparity Between Age and Development in the Human Family.” — J. 
Fred Clark. (Illustrated by pronounced cases due to thyroid malformations.) 
“Some Diseases of Rocky Mountain Plants.” — L. H. Pammel. 
“An Attempt to Illustrate Tides and Tidal Action.” — John L. Tilton. 
(a) “More Light on the Origin of the Missouri River Loess.” (b) “Some 
Variant Conclusions in Iowa Geology.” — J. E. Todd. 
(a) “The Action of Bromic Acid on Metals.” (b) “Logarithmic Factors for 
Use in Water Analysis.” (c) “A List of Chemical Periodicals in Iowa.”“W. S. 
Hendrixson. 
“Liliaceae of Iowa.” — T. J. Fitzpatrick. 
“Mutual Induction and Internal Resistance of a Battery.” — L. Begema.n 
“lachens and Recent Conceptions of Species.” — Bruce Fink. 
“Some Unusual Features of the Maquoketa Shale in Jackson county, Iowa.”— 
T. E. Savage. 
“A Study of the Choroid Plexus.” — Walter J. Meek. 
(a) “The Effect of Pressure on Lines in the Spectrum of Iron.” (b) “A Simple 
Demonstration of the Doppler Effect in Sound.” (c) “The Physical Laboratory 
at Iowa College-” — Frank F. Almy. 
“A Portion of the Iowan Drift Border in Fayette county, Iowa.” — G. E. Finch. 
“The Relation of the Motor Nerve Endings to Voluntary Muscle in Amphibia.” 
— B. A. Place. 
“Notes on the D'iscomycete Flora i*f Iowa.” — Fred J. Seaver. 
(a) “Lime Creek Fauna of Iowa in Southwestern United States and Northern 
Mexican Region.” (b) “Geology of the Corinth Canal Zone.” (c) “Alternation 
of Fossil Faunas.” — Charles R. Keyes. 
“The Collembolan Eye.” — J. E. Guthrie. 
“Flowering Plants of Calcasieu Parish, Louisiana.” — J. M. Lindly. 
“Some Controbutions to Madison county Geology.” — F. A. Brown. 
“Flora of Webster county, Iowa.” — O. M. Oleson and M. P. Somes. 
“Electrical Units.” — K. E. Guthe. 
“The Holding and Reclamation of Sand Dunes by Tree Planting.” — H. P. 
Baker. 
(a)“ The Food of Subterranean Crustacea.” (b) “Number of Bacteria in De« 
Moines School Buildings.” — L. S. Ross. 
“Cladocera in the Vicinity of Des Moines.”— B. O. Gammon. Presented by 
L. S. Ross. 
Photographic Accessories of Drake University Equatorial.” — D. W. Morehouse. 
Introduced by L. S. Ross. 
“Municipal Hygiene — Part II — Milk.” — C. O. Bates. 
“Cyclonic Distribution of Precipitation.” — J. A. Udden. 
Besides the regular papers presented by members of the Academy 
Dr. Hermann von Schrenk of the U. S. Dept, of Agriculture gave an 
address on Friday afternoon on the subject “Some Practical Applica- 
tions of Scientific Research”; Dr. Chas. E. Barnes of the University of 
Chicago delievered a lecture before the Academy on Friday evening on 
the subject “How Plants Breathe”. On Saturday morning Dr. Charles E. 
Bessey of the University of Nebraska presented a paper on the distribu- 
tion of forest trees in Nebraska. 
