PROCEEDINGS. 
441 
438th Meeting. May 11,1895. 
President Dall in the chair. 
Eighteen members present. 
Announcement was made of the election to membership of 
Jesse Pawling, Jr. 
Mr. Rogers Birnie read a paper on Steel cylinders for gun- 
construction; stresses due to interior cooling. [Published in 
this volume, pp. 87-102.] 
It was discussed by Mr. Wead and the author. 
Mr. Alexander S. Christie read a communication on The 
latitude-variation tide. [Published in this volume, pp. 103-122.] 
It was discussed by Messrs. Martin, Paul, Kummell, and 
Hayford. 
439th Meeting. May 25, 1895. 
Vice-President Clarke in the chair. 
Twenty-five members and guests present. 
Announcement was made of the election to membership of 
Adolph Lindenkohl. 
Mr. L. A. Bauer read a communication on The secular varia¬ 
tion of terrestrial magnetism. [Published in American Journal 
of Science, 1895, August, vol. 50, no. 296, pp. 109-115; also Sep¬ 
tember, pp. 189-204; and October, pp. 314-325.] 
Mr. Bauer also read a paper entitled A preliminary analysis 
of the problem of terrestrial magnetism and its variations. [See 
reference above; also Science, vol. i, no. 25.] 
These papers were discussed by Messrs. Abbe, Harrington, 
Christie, and Baker. 
