xii MINUTES. [April 23, 



" A Note on Antarctic Geology." 



" The Italian Riviera — a Study in Geographical Description," 

 by William Morris Davis, Professor of Geology in Harvard 

 University, Cambridge. 



" Some Recent Results in Connection with the Absorption Spec- 

 tra of Solutions," by Harry C. Jones, Professor of Physical 

 Chemistry in Johns Hopkins University. (Introduced by Dr. 

 James W. Holland.) 



" The Propagation of Explosions in Mixtures of Petroleum 

 Vapor with Air in Tubes," by Charles E. Munroe, Profes- 

 sor of Chemistry in George Washington University, Wash- 

 ington, D. C. 



" What Constitutes a Species in Agave," by William Trelease, 

 Director of the Missouri Botanical Garden, St. Louis. 



" The Suppresion and Extension of Sporogenous Tissue in 

 Piper Betel," by D. S. Johnson, Professor of Botany in Johns 

 Hopkins University, Baltimore. (Introduced by Professor 

 John W. Harshberger.) 



"A Method of Using the Microscope," by N. A. Cobb, Crop 

 Technologist in charge of Agricultural Technology, Bureau 

 of Plant Industry, Dept. of Agriculture, Washington. (In- 

 troduced by Professor John W. Harshberger.) 



" The Use of the Hydrometer in Phytogeographic Work," by 

 John W. Harshberger, Assistant-Professor of Botany in Uni- 

 versity of Pennsylvania, Philadelphia. 



Friday Evening, April 22. — 8.15 P. ^I. 



Prof. George E. Hale, F.R.S., Director of the Solar Observatory 

 of the Carnegie Institution, at Pasadena, Cal., gave an illustrated 

 lecture on " The Work of the Mount Wilson Solar Observatory." 



Saturday, April 23. Executive Session — 9.30 o'clock. 

 William W. Keen, AI.D., LL.D., President, in the Chair. 



Candidates for membership were balloted for, and the tellers, 

 Secretary Holland and Dr. Charles Sedgwick Alinot, reported the 

 election of the following:: 



