524 
PHILOSOPHICAL SOCIETY OF WASHINGTON. 
407th Meeting. May 27, 1893. 
President Goode in the chair. 
Thirty-five members present. 
Announcement was made of the election to membership of 
Horace Greeley Van Everen. 
Mr. S. P. Langley read a paper on Recent observations in the 
infra-red spectrum. Illustrated by lantern slides. [Not yet 
published. For some of the facts presented in this paper see 
Nature, Nov. 1,1894, and Report of Brit. Ass. Adv. Sci. for 1894.] 
Remarks were made by Messrs. Bigelow, Harkness, Abbe, 
and Bates. 
Mr. G. K. Gilbert read a paper on The average temperature 
of the earth. [Not published.] 
Remarks were made by Mr. Farquhar. 
408th Meeting. October 28, 1893. 
Vice-President Fletcher in the chair. 
Seventeen members present. 
Announcement was made of the death, on June 14, 1893, of 
Thomas Antisell, one of the founders of the Society; also of 
the death, on August 9,1893, of Thornton Alexander Jenkins, 
also one of the founders of the Society. 
Mr. William Harkness made a communication on The 
oblique aberration of achromatic telescopes. [Not published. 
It is expected to appear hereafter in the publications of the 
United States Naval Observatory.] 
On this communication remarks were made by Messrs. East¬ 
man and Baker. 
Mr. W J McGee read a paper on Classification—chiefly geo¬ 
logical. [This paper was also read before the International 
Congress of Geologists in connection with the World’s Colum- 
