ANNOUNCEMENT OF MEETINGS OF THE ACADEMY AND 



AFFILIATED SOCIETIES 1 



Saturday, January 20 : The Philosophical Society, at the Cosmos Club, 



at 8.30 p.m. Program: 

 L. J. Briggs: Presidential address. — The living 'plant as a physical system. 



Wednesday, January 24 : The Medical Society, at the Medical Depart- 

 ment of the George Washington University, 1325 H Street N. W., 

 at 8 p.m. 



Wednesday, January 24 : The Geological Society, at the Cosmos Club, 

 at 8 p.m. Program: 



D. F. Hewett: The nature of bertonite, and the geologic range of related material 



in the Big Horn Basin, Wyoming. 20 minutes. 

 J. C. Hostetter: The linear force of growing crystals. 20 minutes. Illustrated. 

 J. W. Gidley: Origin of the mammals . 20 minutes. Illustrated. 



Saturday, January 27: The Biological Societj'-, at the Cosmos Club, 

 at 8 p.m. 



Wednesday, January 31 : The Medical Society, at the Medical Depart- 

 ment of the George Washington University, 1325 H Street N. W., 

 at 8 p.m. 



'The programs of the meetings of the affiliated societies will appear on this page if sent to the 

 editors by the thirteenth and twenty-seventh days of each month. 



