IOWA ACADEMY OP SCIENCES. 
15 
t J. A. Udden— The Sweetland Creek Beds. These consist of some thin 
basal layers of blue arenaceous dolomite, overlaid by blue and black 
shale. They rest unconformably on the Cedar Valley limestone in 
places in Muscatine county, and are overlaid uncomformably by the 
coal-measures. Greatest observed thickness is 40 feet. The fossils 
are Pychodus and Ehynchodus remains, a few Lingulus and Spathio- 
caris emersoni Clarke, indicating that the formation belongs to the 
upper Devonian. 
* J. A. Udden — The Pine Creek Conglomerate. 
* J. A Udden — Diatomaceous Earth in Muscatine County. 
* J. E. Todd — New Light on the Drift of South Dakota. 
* B. Shimek — The Distribution of Loess Fossils. 
* B. Shimek — The Iowa Liverworts. A preliminary anotated list of Hepa- 
ticce found in Iowa. 
** J. Fred Clark— The Agency of Plies in the Spread of Disease, (a.) 
Literature on the Subject, (b.) Experimental Proof of Possibility 
of Plies Carrying Germs of Typhoid Fever, (c.) Evidence Prom 
Observations at the Seventh Army Corps Camp of 1898. 
*H. E. Summers — A Generic Synopsis of Nearctic Pentatomidm. 
*T. E Savage —A Preliminary List of the Mosses of Iowa. 
*T. J. AND M. P. L. Fitzpatrick — Flora of Southern Iowa. Three trips 
made overland in a van the last season Large collections were 
obtained; notes written. The region surveyed being the two southern 
tiers of counties, from Decatur county westward to the Missouri 
River, a region of the state of which but little is known botanically. 
Quite a list of rare species and several species not before reported. 
^ B. Fink -Additions to the Bibliography of North American Lichens. 
I C. R. Ball— T he Genus Salix in Iowa. 
g E D. Ball — A Review of the Cercopidse of N. A. north of Mexico. 
*P. C. Myers — Preliminary Report on the Diatoms of Iowa. (1.) General 
distribution. (2 ) Interesting localities. (3.) Diatomaceous depos- 
its. (4.) Geographical distribution. (5.) Variation and prob- 
able cause. 
JT, P. Hall — Extension of the Complex Algebra of the Plane to Three- 
fold Space. 
*P. C. Myers— Report on a Fossil Diatomaceous Deposit in Muscatine 
County, Iowa. (1 ) List of species with general distribution and 
habitat of each. (2.) Probable conditions existing at the time the 
bed was formed. 
^’^Geo. W. Carver— Observations on Some Iowa Fungi. 
** Gilbert L. Houser — The Physical Basis of Nervous Activity. The 
ultimate structure demonstrable in nerve cells; a review of methods 
of investigation; the changes which occur in nerve cells as the result 
of their activity; conclusions as to the seat of nervous energy and its 
mode of liberation. 
* Published in this volume. 
**Read by title. No copy furnished for publication. 
+ Published in the Journal of Geology, 
t Read by title. Abstract furnished. 
§ Read by title. Copy arriving after meeting. 
