OCT. 19, 1921 proceedings: geoi.ogical society 421 



Kilaiica, the Loa gas seems entirely similar in composition. The analyses, 

 in A^olume per cent at 1200° and 760 mm., are given in the table below. 



CO-. 3.84 0.42 



CO 0.03 0.19 



Ho 0.01 



SO. 1.22 1.95 



SO3 2.08 8.12 



S2 



CI2 



N2 16.80 15.39 



A 0.58 0.42 



H2O 75.44 67.43 



E. S. S. 



PROCEEDINGS OF THE ACADEMY AND AFFILIATED 



SOCIETIES 



GEOLOGICAL SOCIETY 

 342d meeting 

 The 342d meeting of the Geological Society of Washington was held at 

 the Cosmos Club at S p.m., on Wednesday, January 28, 1920. 



Regtilar Program 

 G. R. Mansfield: Types of structure in Southern Idaho. (Illustrated.) 

 F. E. Matthes: Physiographic history of the Yosemite region. (Illustrated.) 

 W. Taylor Thom, Jr. : The structttre of the so-called Poplar Dome in north- 

 eastern Montana. 



343d meeting 



The 343d meeting was held at the Cosmos Club at 8 p.m., February 11, 1920. 



Informdl Comnmnication 

 Laurence LaForge spoke on the correct use in physiography of the terms 

 mature and maturity. 



Regular Program 

 H. W. Cornell: Constitutional questions involved in the statutory classifica- 

 tion of mines and minerals for purposes of taxation. 

 ]M. R. Campbell: Abandoned meanders of James and Potomac Rivers and 

 their bearing on Coastal Plain history. 



special meeting 

 A joint meeting with the Washington Academy of Sciences was held in 

 the auditorium of the Cosmos Club at 8:15 p.m. on Thursday, February 

 19, 1920. The occasion was a lecture V>y Alfred H. Brooks on The appli- 

 cation of geology to war. An abstract of the lecture has been published with 

 the Proceedings of the Academy in this Journal.^ 



344th meeting 

 The 344th meeting was held at the Cosmos Club at 8 p.m., on Wednesday, 

 March 10, 1920. 



' This JouR.v.\L, 10: 331-333. 1920. 



