1860.] 2G1 [Chase, 



and Dublin Societies ; the University of Lund ; the Observa- 

 tory at Turin ; the Geographical Societies at St. Petersburg, 

 Dresden, Paris, and London ; the Geological Societies at 

 Vienna, Berlin, and Leeds ; the Zoologico-Botanical Societies 

 at Vienna, Berlin, and Frankfort-am-Maine ; the Natural 

 History Societies at Bremen, Bonn, and Boston; the Acad- 

 emy of Natural Sciences, Philadelphia ; the Geological Sur- 

 vey of Canada ; American Journal of Sciences ; Cooper 

 Union ; Historical Magazine at Morrisiana ; the Medical 

 News ; J. A. Meigs, M. Carey Lea, and Wm. Duane, of 

 Philadelphia; Dr. Steiner, of Baltimore; Prof. Dana, of 

 New Haven; Dr. Schinz, of Strasbourg; M. des Moulines, 

 and M. Trimoulet, of Bordeaux ; Mr. Alex. Winchell, of Ann 

 Arbor ; and the California Academy. 



The decease of a member, Mr. Matthias W. Baldwin, in 

 Philadelphia, on the 7th inst., was announced by Mr. Fraley. 

 On motion, Mr. Franklin Peale was appointed to prepare an 

 obituary notice of the deceased. 



The decease of another member. Dr. A. A. Gould, at Bos- 

 ton, Massachusetts, on the 17th inst., aged 57, was announced 

 by Mr. T. P. James. 



Prof. H. C. Wood offered for publication in the Transac- 

 tions, a paper entitled " A Contribution to the Knowledge of 

 the Flora of the Coal Period of the United States," which, on 

 motion, was referred to a committee consisting of Mr. Les- 

 quereux, Mr. T. P. James, and Mr. Lesley. 



Mr. P. E. Chase read a communication "On the Relations 

 of Temperature to Gravity and Density :" 



It has long been known that the temperature of the air is, to some 

 extent, dependent upon its gravity and density. Among the promi- 

 nent indications of this dependence are : 



1. The diminution of temperature upon mountains and in balloon 

 ascents. 



2. The equation of oscillation (y = y/'2 yli), which applies to all 

 undulations, whether of heat, light, electricity, or material bodies. 



