IOWA ACADEMY OF 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 Rhynchodus remains, a few Lingulus and Spathio- 

 caris emersoni Clarke, indicating- that the formation belong's 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. SHTMf K — The Iowa, Liverworts. A preliminary anotated list of Hepa- 



ticce found in Iowa. 



** J. Fred Clark— The Agency of Flies in the Spread of Disease, (a.) 

 Literature on the Subject (b. ) Experimental Proof of Possibility 

 of Flies Carrying Germs of Typhoid Fever, (c ) Evidence From 

 Observations at the Seventh Army Corps Camp of 1898. 



*H. E. Summers — A Generic Synopsis of Nearctic Pentatomidce. 



*T. E Savage —A Preliminary List of the Mosses of Iowa. 



*T. J. AND M. F. L. FjTZPATRICK— 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,— The Genus Salix in Iowa. 



I E D. Ball— A Review of the Cercopida? 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. Ball— Extension of the Complex Algebra of the Plane to Three- 

 fold Space. 



*P. C. Myebs— 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 F^'hysical 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 tliis volume. 



**Rea(l by title. No copy furnished for publication. 

 + Published in the Journal of Geology. 

 1: Read by title. Abstract furnished. 

 § Read by title. Copy arriving- after meeting. 



