Proceedings. 303 



Prof. N. H. Winchell read a paper entitled 'The Eastern 

 equivalents of the Minnesota iron ores." 



[This paper is published in full in Bulletin No. 6, Geological 

 and Natural History Survey of Minnesota, ''The Iron Ores of 

 Minnesota." pp. 411-419.] 



Uly. S. Grant discussed some "Notes on a collecting trip into 

 the Tertiary of Maryland and Virginia." 



[abstract,] 

 A brief account of the annual geological expedition of the Johns Hop- 

 kins University for 1890 was given. The different formations of the coastal 

 plain — from the Potomac (late Mesozoic) to the recent — and the charac- 

 teristic fossils of each were noted. Most of the fossils collected were 

 found in the Tertiary, where remains of molluscan life are extremely 

 abundant. This formation is divided into an upper and a lower member, 

 each of which consists mainly of variegated sands and blue clays. As a 

 rule diese are unconsolidated, rendering the collection of well preserved 

 fossils comparatively easy. The general similarity of the fauna to that 

 now existing along the eastern coast was noted, and attention was called 

 to very large specimens of Ostrea and of a certain Venus, which is thought 

 to be a large variety of the common edible clam {Venus mercenaria). A 

 few photographs were shown, exhibiting the abundance of certain forms — 

 Pcctcn and Turritella — in some of the beds. 



C. W. Hall gave some notes from the Indianapolis meeting 

 of the A. A. A. S. and the excursion of the Association into the 

 gas fields of Indiana. 



Horace V. Winchell presented the Academy with four (4) 

 small aerolites which fell in Winnebago county, Iowa, May 2, 

 1890. 



Through Librarian Herbert Putnam, Mrs. Wm. Welch pre- 

 sented the Academy with a group of quartz crystals from Corn- 

 wall, England. The thanks of the Academy were voted Mrs. 

 Welch and Mr. Winchell. 



November 11,1 390. 



Fifty persons present. 



E. F. Allen, J. F. Calhoun, Rev. D. S. McCaslin, G. A. 

 Smith, E. P. Sheldon, of Minneapolis, Prof. Henry S. Baker, of 

 Saint Paul, Benedict Juni, of New Ulm, were elected members. 



The report of the evening was from the section of Sanitary 

 Science, Dr. Chas. N. Hewitt, chairman. 



Dr. Hewitt gave an address in which he discussed : The 

 causes, prevention and control of those things which occasion 



