ANNOUNCEMENTS OF MEETINGS OF THE ACADEMY AND 



AFFILIATED SOCIETIES 



Wednesday, March 23. The Geological Society, at the Cosmos Club, at 

 8 p.m. Program: 



L. H. Adams : The elastic properties of rocks. 



L. La Forge: A suggested modification of the doctrine of peneplanation in the light of 

 recent knowledge. 



Thursday, March 24. The Chemical Society, at the Cosmos Club, at 8 p.m. 



Saturday, March 26. The Philosophical Society, at the Cosmos Club, at 

 8.15 p.m. 



Saturday, April 2. The Biological Society, at the Cosmos Club. 



Wednesday, April 6. The Society of Engineers. 



PROGRAMS ANNOUNCED SINCE THE PRECEDING ISSUE OF THE JOURNAL.^ 



Tuesday, March 1. The Botanical Society, at the Cosmos Club, at 8 p.m. Program: 

 Haven Metcalf: The story of a plant introduction. 



Tuesday, March 1. The Anthropological Society, at the National Museum, at 4.45 p.m. 



Program: J. Walter Fewkes: The Fire Temple of the Cliff Dwellers. 



/ 



Wednesday, March 2. The Society of Engineers, at the Cosmos Club, at 8 p.m. Pro- 

 gram : WmiAM MiTCHELi< : The development of an air force as a national asset. 



Thursday, March 3. The Entomological Society, at the National Museum, at 8 p.m. 

 Program: R. E. Snodgrass: Life history of the ribbed cocoon maker and the resplendent 

 shield-bearer of the apple. 



Saturday, March 5. The Biological Society, at the Cosmos Club, at 8 p.m. Program : 

 H. M. Hah,: The synthetic method of botanical taxonomy. 



Thursday, March 10. The Chemical Society, at the Cosmos Club, at 8 p.m. Program: 

 E. T. Wherry: Chemical crystallography. R. W. G. Wyckoff: X-rays and crystal 

 structure. 



Saturday, March 12. The Philosophical Society, at the Cosmos Club, at 8.15 p.m. Pro- 

 gram: T. S. SUGH, Jr.: Recent modifications in resistance thermometer construction. 

 R. M. Wn^HELM and Amelia K. Benson: A comparison of the International Hydrogen 

 Scale with the standard scale of temperature defined by the platinum resistant e thermom- 

 eter. C. O. Fairchild: New methods of sealing optical glass. 



* Received too late for publication before the date of the meeting. 



