OFFICERS OF THE ACADEMY 



President: F. L. Ransome, Geological Survey. 



Corresponding Secretary: Robert B. Sosman, Geophysical Laboratory. 

 Recording Secretary: Wii^liam R. Maxon, National Museum. 

 Treasurer: R. L,. Faris, Coast and Geodetic Surv^ey. 



ANNOUNCEMENT OF MEETINGS OF THE ACADEMY AND 



AFFILIATED SOCIETIES 



Tuesday, May 20. The Historical Society. 

 Wednesday, May 2 i . The Medical Society. 



Thursday, May 22. The Chemical Society, at the Cosmos Club, at 

 8.15 p.m. Program: 



H. D. GiBBS: The tvork of the Color Laboratory of the Bureau of Chemistry. 



K. P. Monroe: The commercial preparation and utilization of the enzyme invertase. 



Saturday, May 24. The Philosophical Society, at the Cosmos Club, 

 at 8.15 p.m. Program: 



V 

 H. L. Curtis and R. C. Duncan: Measurement of short time intervals. (Illus- 

 trated.) 20 minutes. 

 A. F. Beal : Comparison of invar with steel as shown by the rates of high-grade watches. 

 (Illustrated.) 40 minutes. 



Monday, May 26. Board of Managers, Washington Academy of 



Sciences. 

 Tuesday, May 27. The Washington Academy of Sciences, at the 



Cosmos Club, at 8.15 p.m. Program: 



A. O. Leuchner: The determination of the orbits of comets and planets. 

 Wednesday, May 28. The Medical Society. 



