ANNOUNCEMENT OF MEETINGS OF THE ACADEMY AND 



AFFILIATED SOCIETIES 1 



Saturday, October 20: The Biological Society, at the Cosmos Club, at 

 8 p.m. 



Wednesday, October 24 : The Medical Society, at the Medical Depart- 

 ment of George Washington University, 1325 H Street, NW., at 

 8 p.m. 



Saturday, October 27 : The Philosophical Society, at the Cosmos Club, 

 at 8:15 p.m. Program: 



J. T. Tate and P. D. Foote: Critical potentials for electrons in metallic vapors. 



(Illustrated.) 30 minutes. 

 S . J. Croo keu (by invitation) : Experiments on direct current corona. (Illustrated.) 



30 minutes. 



Wednesday, October 31 : The Medical Society, at the Medical Depart- 

 ment of George Washington University, 1325 H Street, NW., at 

 8 p.m. 



•The programs of the meetings of the affiliated societies will appear on this page if sent to the edi- 

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



