20 ILLINOIS ACADEMY OF SCIENCE. 



think I ought to explain why the Saturday afternoon meeting is 

 not to be held at the Field Museum. In communicating with 

 Director Skiff it was found that there would be no available room 

 for such a conference, and therefore it was found impossible to 

 hold a session there. It was through some misunderstanding that 

 the meeting was so announced. There will be an opportunity on 

 Saturday for personal visits, but this will be a personal matter 

 and not a matter for the Academy as such. 



Mr. Farrington. — "We regret very much that it is impossible 

 to hold the meeting in the Field Museum, but we certainly hope 

 that you will feel that this is a cordial invitation to visit the 

 museum, and if you will try to arrange for one o'clock Saturday 

 afternoon, we will have an hour together which we can spend in 

 a way that will accomplish more than if we go individually. We 

 sincerely hope that you will accept this invitation." 



The following papers were presented : 



Post-glacial Life of Wilmette Bay, Glacial Lake, Chicago, by 

 Frank Collins Baker. (Illustrated.) 



Structure of the Adult Cycad Stem, by C. J. Chamberlain. 

 (Illustrated.) 



A Preliminary List of the Ants of Illinois, by Maurice Cole 

 Tanquary. 



The Eastward Extension of the Sweetland Creek Shale in 

 Illinois, by J. A. Udden. 



The meeting adjourned at twelve o'clock, noon. 



Afternoon. 

 Botany Building, 2 p. m. 



President Coulter called the meeting to order. 



Mr. J. M. Webb, of Urbana, demonstrated the use of oxygen 

 in mine rescue work. An oxygen helmet was shown and the 

 method of its working was graphically explained. 



Prof. A. A. Michelson of the University of Chicago, addressed 

 the Academy on "Metallic Colors in Birds and Insects." The 

 stereopticon was used for the purpose of illustration and several 

 boxes of insects and birds showing metallic colors, procured by 

 Prof. Michelson in Brazil, were exhibited. 



The following papers were presented : 



The Mollusca of Piatt, Champaign and Vermilion Counties, 

 Illinois, by James Zetek. (Illustrated). 



