20 IOWA ACADEMY OF SCIENCES. 



20. "The Ustilaginae of Iowa."— H. H. Hume. 



21. ' 'The Sanitary Analyses of Some Iowa Deep Well Waters."— J. B. 

 Weems. 



22. "The Chemical Composition of Sewage of the Iowa State College 

 Sewage Plant." — J. B. Weems, J. C. Brown and E. C. Myers. 



23. "Menke's Method of Preparing Hyponitrites. " — Alfred N. Cook. 



24. "Calcium Carbide as a Dehydrating Agent for Alcohols." — Alfred 

 N. Cook and A. L. Haines. 



25. "The Sioux City Water Supply. "—Alfred N. Cook and C. F. 

 Eberly. 



26. "On the Occurrence of Rhizopods in the Pella Beds in Iowa."— J. 

 A. Udden. 



27. "Pleuroptyx in the Iowa Coal Measures. "—J. A. Udden. 



28. ' 'Factors in the Extinction of Animals." — Herbert Osborn. 



29. "Analyses of Certain Clays Used in the Manufacture of Cedar 

 Rapids Paving Brick." — C. O. Bates. 



