ANNOUNCEMENT' OF MEETINGS OF THE ACADEMY AND 



AFFILIATED SOCIETIES 1 



Tuesday, March 21 : The Anthropological Society, in the lecture rpom 

 of the District Public Library, at 8 p. m. Program: 



Miss Frances Densmore: Mandan music. Mr. Heinrich Hammer will play 

 some of his compositions based upon Miss Densmore's records. 



Wednesday, March 22 : The Geological Society, at the Cosmos Club, 

 at 8 p. m. Program: 



R. B. Sosman and J. C Hostetter: Zonal growths in hematites and their 

 bearing on the origin of certain iron ores. Illustrated. 20 minutes. 



R. W. Pack : Structural features of the San Joaquin Valley oil field, California. 



Illustrated. 20 minutes. 



'i 



C. T. Lupton: Notes on the stratigraphic and structural relations in the southern 

 and portions of the Big Horn Basin, Wyoming. 20 minutes. 



Thursday, March 23 : The Washington Academy of Sciences, in the 

 Auditorium of the New National Museum, at 8.30 p. m. Program: 



Dr. L. H. Baekeland, member of the Naval Consulting Board. Chemistry in 

 relation to the war. Illustrated. 



Saturday, April 1 : The Philosophical Society, at the Cosmos Club, 

 at 81.5 p. m. Program: 



R. S. Woodward: The extraction of square roots of numbers. 20 minutes. 



Wm. W. Fraser: Vectors and Quaternions: What has been done and what can 

 be done. 20 minutes. 



W. J. Spillman: A graphic method for the determination of the average interval 

 between departures from the mean greater than a given departure. 15 minutes. 



'The programs ol the meetings ot the affiliated societies will appear on this ^age if sent to the 

 editors by the first and fifteenth days of each month. 



