IOWA ACADEMY OF SCIENCES. 



The seventh annual session or the Iowa Academy of Sciences was 

 held in the High School building at Cedar Rapids December 27 and 

 28, 1892. 



The following papers were presented: 



S. Calvin — "The Relation of the Woodbury Sandstones and Shales and the 

 Inoceranius Beds of White to the Subdivisions of the Cretaceous proposed by Meek 

 and Harden ;" "Note on the Structure and Probable Affinities of Cerionites dacty- 

 lioides Owen." 



C. R. Keyes — "Natural Gas and , Oil in Iowa;" Some Mineralogical Notes;" 

 "Surface Disintegration of Granitic Masses;" "Some American Eruptive Gran- 

 ites." 



J. L. TiLTON — "Strata Between Ford and Winterset." 

 C. 0. Bates— "The Analysis of Water for Railway Engines." 

 F. M. Witter — "Some Observations on Helix cooperi;" "On the Absence of 

 Ferns between Fort Collins and Meeker, Colorado;" "Notice of Stone Implements 

 from Mercer County, Ills., and Louisa County, Iowa." 



GiLMAN Drew— "Some Reason Why Frogs are Able to Survive." 

 C. C. Nutting— Presidential Address— "What We Have Been Doing; " "Report 

 of Committee on State Fauna; " "The Significance of the Concealed Crests of the 

 Flycatcher." 



L. H. Pammel— " Phicnological Notes for 1892; " "Relation of Frost to Certain 

 Plants; " " Notes on the-Flora of Texas; " " Pollination of Cucurbits. " 



F. C. Stewakt— " Palisade Cells and Stomata of Leaves; " " A Key for the 

 Identification of Weed Seeds found in Clover Seed." 

 F. Rkppert — " Notes on the Flora of Muscatine." 



W. B. Niles— " Preliminary Observations on a Cattle Disease of Frequent Oc- 

 currence in Some Parts of Iowa." 



F. W. Mally— Preliminaiy List of the Saw-flies of Iowa." 

 H. A. Gossard — " Observations of Insects Taken in Clover." 



Herbert Osborn and F. A. Sirrine "Notes on Aphididse." 



Herbert OsBORN—" On the Life-Histories of Certain Jassidae;" "Notes on 

 the Catalogue of the Iowa Hemiptera." 



A talk on a Collecting Trip to Southern Mexico, illustrated with Lantern View.s. 



