I909.J MINUTES. xi 



elson, of Chicago. Discussed by Prof. Robert W. Wood, Prof. M. 

 B. Snyder and Prof. Doolittle. 



" On an Adjustment for a Plane Grating similar to Rowland's 

 for the Concave Grating," by Prof. Carl Barus, assisted by M. Barus, 

 of Providence. 



" The Electron Method of Standardizing the Coronas of Cloudy 

 Condensation," by Prof. Carl Barus, of Providence. 



" The Electrometric Measurements of the Potential Difference 

 between two Conductors of a Condenser containing a highly Ionized 

 Medium," by Prof. Carl Barus, of Providence. 



" Solar Activity and Terrestrial Magnetic Disturbances," by Dr. 

 L. A. Bauer, of Washington. Discussed by Prof, Kennelly and Dr. 

 Bauer. 



" The Effect of Temperature on the Absorption Spectra of Cer- 

 tain Solutions," by Prof. Harry C. Jones, of Baltimore. (Intro- 

 duced by President Ira Remsen.) 



" The Specific Chemo-Therapy of the Protozoal Diseases," by 

 Dr. Simon Flexner, of the Rockefeller Institute for Medical Re- 

 search, New York. 



" The Unsuspected Presence of Habit-Forming Agents in Bever- 

 ages and Medicines," by Dr. Lyman F. Kebler, of Washington. 

 (Introduced by Dr. Harvey W. Wiley.) Discussed by Dr. E. A. 

 Spitzka and Dr. Kebler. 



Afternoon Session — 2.30 o'clock. 



William B. Scott, LL.D., Vice-President, in the Chair. 



Prof. William Herbert Hobbs and Mr, Abbott Lawrence Lowell, 

 newly elected members, were admitted into the Society. 

 The following papers were read : 



Symposium on Earthquakes. 



" Introduction — Classification — Discussion of Volcanic Earth- 

 quakes — Description, with illustrations, of the Charleston, S. C, and 

 Kingston, Jamaica, Disasters," by Prof. Edmund O. Hovey, of New 

 York. (Introduced by Prof. W. B. Scott.) 



"The Present Status and the Outlook of Seismic Geology," by 

 Prof. William H. Hobbs, of Ann Arbor, Mich. 



