INDEX. 



PACE 



Officers of the Academy 3 



Membership of tlie Academy 5 



Constitution 6 



Note on Origin and Objects of the Academy 9 



Lists of meetings 10 



Notes on the Geology of Northwestern Iowa 13 



Exhibition of Volcanic Dust from Omaha, Nebraska 16 



The Shore Lines of Ancient Glacial Lakes 17 



Striation of Rocks by River Ice ly 



Eastern Extension of the Cretaceous in Iowa 31 



Contribution to the Fauna of the Lower Coal Measures of Central Iowa 22 



A New Couocardium from the Iowa Devonian 23 



Preliminary note ou the Sedentary Habits of Platyceras 24 



Evolution of Stophostylus 25 



Age of Certain Sandstones near Iowa City 26 



Notes on the Red Rock Sandstone 26 



Geological Structure and Relations of the Coal Rearing Stata of Cen- 

 tral Iowa 27 



Brick and Other Claj's of -Des Moines 29 



Aluminum in Iowa 29 



Ou a Quartenary Section Eight Miles Southeast of Des Moines Iowa 30 



Note ou the Dilierences between AcQrmdaria profunda Hall, and Acer- 



vtilaria davidsoni Edwards and Haime. 30 



Notes on Missouri Minerals 33 



Prismatic Sandstone from Missouri '. 36 



The Tertiary Silicitied Woods of Eastern Arkansas 37 



The Fishes of the Des Moines Basin 43 



On an Abnormal Hyoid Bone in the Humau Subject 56 



Artesian Wells in Iowa 57 



Some Experiments for the Purpose of Determining the Active Principles 



of Bread Making 64 



Aboriginal Rock Mortars 64 



Notice of Arrow Points from the Loess in the City of Muscatine 66 



The Gas Wells ne-ar Letts, Iowa 6S 



A New Distilling Flask for Use in the Kjeldalil Process 71 



Composite Milk Samples in the Laboratory 73 



On a New Astatic Galvanometer with a Single Spiral Needle 75 



Woody Plants of Western Wisconsin 76 



Forest Vegetation of the Upper Mississippi 80 



