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ANNOUNCEMENT OF MEETINGS OF THE ACADEMY AND 
AFFILIATED SOCIETIES 
Tuesday, February 6. The Botanical Society. 
Wednesday, February 7. The Washington Society of Engineers. 
Thursday, February 8. The Chemical Society. 
Saturday, February 10. The Philosophical Society. 
Tuesday, February 13. The Society of Electrical Engineers. 
Wednesday, February 14. The Geological Society. 
Thursday, February 15. The Washington Academy. 
W. D. Coutuins, Geological Survey: Industrial aspects of modern methods of water 
purification (Illustrated). 
Saturday, February 17. The Biological Society. 
PROGRAMS ANNOUNCED SINCE THE PRECEDING ISSUE OF THE JOURNAL! 
Tuesday, January 9. The Washington Academy of Sciences, at the Carnegie Institute, 
8.15 p.m. Program: W. J. Hompnrers: The murmur of the forest and roar of the 
mountain (presidential address); election of officers. 
Wednesday, January 10. The Geological Society, at the Cosmos Club, at 8 p.m. 
Program: A. J. Couuier: Some features of the geology of the Litile Rocky Mountains. 
M. R. Campsetu: The Pulaski overthrust fault in southwestern Virginia. N. H. 
Darton: Some Arizona problems. 
Saturday, January 13. The Philosophical Society, at the Cosmos Club, at 8.30 p.m. 
Program: E, C. CrirrenpEen: The measurement of light (presidential address). 
TNotices received too late for publication before the date of the meeting. 
