ANNOUNCEMENT OF MEETINGS OF THE ACADEMY AND 



AFFILIATED SOCIETIES 1 



Saturday, May 19 : The Biological Society, at the Cosmos Club, at 

 8 p.m. 



Wednesday, May 23 : The Geological Society, at the Cosmos Club, at 

 8 p.m. 



Saturday, May 26: The Philosophical Society, at the Cosmos Club, at 

 8.15 p.m. Program: 



L. W. B. Rees, Royal Flying Corps; Some difficulties encountered by the military 

 aviator. 30 minutes. 



W. R.-Blair: Aerology in aid of aeronautics. (Illustrated.) 20 minutes. 



> The programs of the meetings of the affiliated societies will appea r on this page if sent to the editor* 

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



