28 BULLETIN OF THE 



The subject was discussed by Messrs, Antisell, White, and 

 Endlich. 



Mr. C. E. Dutton made a communication on 



the geological character of the COLORADO RIVER. 



Comments were made and questions asked by Messrs. White, 

 Endlich, and Hall. 



156th Meeting. February 15, 1819. 



Vice-President Welling in tlie Chair. 

 Thirty-eight members and visitors present. 



The minutes of the last meeting were read and adopted. 



The election of Mr. Bernard Richard Green, Major Peter 

 Conover Hains, U. S. Engineers, Commander GtEORge Dewey, 

 U. S. Navy, and Mr. Frederick Borden McGuire, as members 

 of the Society, was announced. 



Mr. Thomas Antisell read a paper entitled 



observations on chemical molecular changes. 



Remarks were made and questions asked by Mr. Harkness, 

 Prof. F. W. Clarke, of Cincinnati, Mr. Doolittle, and Mr. 

 Dall. 



157th Meeting. March 1, 1819. 



Vice-President Taylor in the Chair. 

 Thirty-eight members and visitors present. 



The deaths of Dr. John C. Riley and of Prof. Mordecai 

 Yarnall, U. S. Navy, members of the Society, v/ere announced. 



The election of Lieut. Comr. Charles D. Sigsbee, U. S. N., 

 as a member of the Society, was also announced. 



