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ANNOUNCEMENT OF MEETINGS OF THE ACADEMY AND 
AFFILIATED SOCIETIES 
Saturday, April 28. The Biological Society. 
PROGRAMS ANNOUNCED SINCE THE PRECEDING ISSUE OF THE JOURNAL 
Thursday, April 5. The Entomological Society, at the National Museum, at 8 p.m. 
Program: Prrez Simmons: The housefly plague in American expeditionary force. 
C. C. Haminron: Biology of tiger beetles. 
Saturday, April 7. The Philosophical Society, at the Cosmos Club, at 8.15 p.m. 
Program: C. W. Kanout: Liguid and solid hydrogen. N. H. Huck: Relation of 
seismology to geodesy and tides. J. B. Ives: On the nature of the illumination used 
by engravers of steel plates. 
Tuesday, April 10. . The Geological Society, special meeting, at the auditorium of the 
Interior Building. Program: Geology as seen from the air. 
Wednesday, April 11. The Geological Society, at the Cosmos Club, at 8 p.m. 
Program: Krrx Bryan: Pedestal rocks near Lee’s Ferry, Arizona. J. D. Sears: 
Relation of the Brown’s Park formation and the Bishop conglomerate and their role 
in the origin of Green River. Franx L. Huss: Uses of the rarer metals. 
Tuesday, April 17. Joint meeting of the Acappmy, Philosophical Society, and Chem- 
ical Society, at the auditorium of the Interior Building, at 8.30 p.m. Program: 
Remarks on their recent researches in chemistry by Dr. F.G. Donnan, University 
College, London, and Dr. J. C. Invinu, University of St. Andrews. 
Wednesday, April 18. Joint meeting of the Acapemy, Geological Society, and Philo- 
sophical Society, at the auditorium of the Interior Building, at 8.15 p.m- 
Program: Symposium on The Taglor-Wegener hypothesis. Frank B. Taytor: The 
lateral migration of land masses. R. A. Daty: A critical review of the hypothesis. 
W. D. Lampert: The mechanics of the hypothesis. Frep. E. Wrieut: Report of the 
symposium at the meeting of the British Association. 
