PROCEEDINGS. 
537 
the American Meteorological Journal. 8°, Boston, 1894, May, 
vol. 11, No. 1, pp. 1-6.] 
This was discussed by Messrs. Harkness, Gilbert, Preston, 
and Abbe. 
422d Meeting. May 12, 1894. 
Vice-president Dall in the chair. 
Forty-six members and guests present, of whom six were 
women. 
i . 
Professor T. C. Mendenhall made a communication on Gravi¬ 
tation work, and accompanied it by an exhibition of some 
quarter-second gravity pendulums and accompanying apparatus. 
[Not published.] 
The communication was discussed by Messrs. Abbe, New¬ 
comb, Bates, Eimbeck, and Doolittle. 
Mr. F. H. Bigelow made a communication entitled Tempera¬ 
ture inversions in the solar magnetic period. [Published in the 
American Journal of Science. 8°, New Haven, 1894, Dec., 3d 
series, vol. 48, no. 288, pp. 435-451.] 
The paper was discussed by Messrs. Abbe and Wead. 
Mr. Elmer Gates read a paper on The artificial transforma¬ 
tion of simple organisms. [Not published.] 
The paper was discussed by Mr. Ward. 
423d Meeting. May 26, 1894. 
Vice-president Clarke in the chair. 
Twenty-one members present. 
Mr. J. K. McCammon read an obituary notice of Asa Owen 
Aldis. [Published in this volume, pp. 433-435.] 
Mr. D. W. Prentiss read an obituary notice of Edward T 
Fristoe. [Published in this volume, pp. 460-461.] 
Mr. C. Hart Merriam read a paper on The temperature con¬ 
trol of the geographic distribution of plants and animals. [Pub- 
