ANNOUNCEMENT OF MEETINGS OF THE ACADEMY AND 



AFFILIATED SOCIETIES^ 



Tuesday, March 5: The Anthropological Society. 



Tuesday, March 5: The Botanical Society, at the Cosmos Club, at 

 8 p. m. 



Thursday, March 7: The Washington Academy of Sciences, at the 

 Cosmos Club, 8:15 p. m. Program: 



Col. C. F. Lee, of the British Aviation Mission: Aviation. 



Saturday, March 9 : The Biological Society, at the Cosmos Club, at 

 8 p. m. 



Wednesday, March 13: The Geological Society, at the Cosmos Club, 

 at 8 p. m. 



Thursday, March 14: The Society of Foresters. Program: 



E. H. Clapp, H. S. Betts, and^RoLF Thelex: Forest products and the war. 



Saturday, March 16: The Philosophical Society, at the Cosmos Club, 

 at 8 p. m. Program: » 



J. H. Dellinger/ of the' Bureau of Standards: The principles of electrical 

 measurements at radio frequencies. (Illustrated) 



P. D. Merica, of the'Bureau of Standards: Relative thermal expansivities of the 

 constituents of brass. (Illustrated) 



G. W. ViNAL, of the Bureau of Standards : Some electrical properties of silver 

 sulfide. 



> The programs of the meetings of the affiliated Societies will appeal on this page if sent to the 

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



