ANNOUNCEMENT OF MEETINGS OF THE ACADEMY AND 



AFFILIATED SOCIETIES 1 



Saturday, May 5: The Biological Society, at the Cosmos Club, at 

 8 p.m. 



Thursday, May 10: The Chemical Society, at the Cosmos Club, at 

 8 p.m. 



Saturday, May 12: The Philosophical Society, at the Cosmos Club, 

 at 8.15 p.m. Program: 



1. G. Priest and C. G. Peters: An interferential method for measuring the 

 expansion of very small samples (Illustrated.) 30 minutes. 



J. D. Edwards (by invitation): Rapid determination of gas density. (Illus- 

 trated) 30 minutes. 



1 The programs of the meetings of the affiliated societies will appear on this page if sent to the editors 

 by the thirteenth and twenty-seventh day of each month. 



