OFFICERS OF THE ACADEMY 



President: Carl L. Alsberg, Bureau of Chemistry. 

 Corresponding Secretary: Robert B. Sosman, Geophysical Laboratory. 

 Recording Secretary: Wiluam R. Maxon, National Museum. 

 Treasurer: R. L. Faris, Coast and Geodetic Survey. 



ANNOUNCEMENT OF MEETINGS OF THE ACADEMY AND 



AFFILIATED SOCIETIES^ 



Tuesday, April 20. The Anthropological Society. 



Wednesda3^ April 21. The Washington Society of Engineers. 



Thursday, April 22. The American Meteorological Society. 



Friday and Saturday, April 23 and 24. The American Physical Society 

 at the Bureau of Standards. 



Saturday, April 24. The Philosophical Society, at the Cosmos'Club, 



at 8.15 p.m. Program: 

 W. H. SouDER and C G. Peters: Physical properties of dental materials. 

 H. A. Marmer: Results of recent tidal investigations. 



Wednesday, April 28. The Chemical Society, at the Interior Depart- 

 ment, at 8.15 p.m. Program: 

 W. A. NoYES: The foundations for chemical development. 



Saturday, May i. The Biological Society. 



1 The programs of the meetings of the affiliated societies will appear on this page if »ent to th« 

 Editors by the thirteenth and twenty-seventh of the month. 



