504 
PHILOSOPHICAL SOCIETY OF WASHINGTON. 
He was followed by Mr. J. R. Eastman, who read a paper on 
The Mexican meteorites. [Published in this volume, pp. 39-52.] 
This paper was discussed by Messrs. Hill, Gilbert, Merrill, 
Bigelow, Paul, Mendenhall, and Eastman. 
380th Meeting. January 16, 1892. 
President Gilbert in the chair. 
Twenty-five members and guests present. 
Announcement was made of the election to membership of 
George Rockwell Putnam, of the United States Coast and 
Geodetic Survey. 
Mr. W J McGee read a paper on The Gulf of Mexico as a 
measure of isostasy. [Published in American Journal of Science. 
8°, New Haven, 1892, Sept., 3d ser., vol. 44, no. 261, pp. 177-192.] 
It was discussed by Messrs. Gilbert, Abbe, Harkness, Wood¬ 
ward, Taylor, Hill, Willis, Dall, Christie, and McGee. 
Special Meeting. January 20, 1892. 
President Gilbert in the chair. 
Attendance, about two hundred. 
By the courtesy of the authorities of the Columbian University 
a special meeting was held in the lecture room of that institu¬ 
tion to listen to the annual address of the retiring president, 
Mr. T. C. Mendenhall. His subject was The uncertainty of 
conclusions. [Published in this volume, pp. 1-18.] 
381st Meeting. January 30, 1892. 
President Gilbert in the chair. 
Seventy-five members and guests present. 
By invitation, Dr. Joseph Le Conte, President of the Ameri¬ 
can Association for the Advancement of Science, read a paper 
