252 SOCIETY OF NATURALISTS. 



The following invitation, extended to the members of the 

 Society, was then read : — 



"Dr. E. J. James, President of the American Society tor the 

 extension of University Teaching, invites the members of this 

 Society to the President's reception, given in connection with the 

 first Annual National Conference on the extension of University 

 Teaching." 



The morning session for Wednesday was fixed for lo A.M., 

 and tlie afternoon session for 2.30 P.AI. 



The President's address, 



"Twenty-five Years of Scientific Progress," was read by 

 Prof. Wm. North Rice, the retiring president. 



The following papers were then read : — 



Miss Emily L. Gregory, on "The two Schools of Plant Physi- 

 ology as at present existing in Germany and England." 



Professor Macloskie, on "The Structure of Insect Tracheie," 



Professor Macloskie (for Mr. McClure, of Princeton), " Ob- 

 servations on the Poison Apparatus of Young Rattlesnakes." 



Professor Pillsbury, "A Device for Attaching Labels to 

 Specimen Bottles." 



Prop\ H. F. Osborn, " Nomenclature of the Mammalian 

 Molar Cusps." 



The meeting then adjourned. 



December 30, 1S91. 

 MORNING SESSION, 10 A.M. 



President Rice in the chair. 



Thirty members present. 



In the absence of Prof. Wm. T. Sedgwick, the Treasurer's 

 report was read by the Secretary. 



The Treasurer of the American Society of Naturalists respcct- 

 fullv submits the foUowin"- 



