RECORDS OF MEETINGS OF 1906 289 



SECTION OF GEOLOGY AND MINERALOGY. 

 May 14, 1906. 



Section met at 8:30 P. M., Vice-President Hovey presiding. 



The minutes of the last meeting of the Section were read and approved. 



The following program was then offered: 



William Campbell and 1 The Microscopic Examination of the Silver 

 C. W. Knight, j Deposits of Temiskaming, Ont. (By title.) 



Henry S. Washington, A Petrographic Study of the Lavas of Ve- 

 suvius. (Illustrated with lantern slides.) 

 E. Otis Hovey, Comparison of Vesuvius and Mont Pele, with 



Special Reference to Recent Eruptions. 

 (Illustrated with lantern slides.) 

 James F. Kemp, The Volcanic and Seismic Disturbances in 



North America; The California Earth- 

 quake of 1906. (Illustrated with lantern slides.) 

 Wm. Hallock, Instrumental Detection and Record of 



Earthquakes. (Illustrated with lantern slides.) 



Summary of Papers. 



In reference to their paper Messrs. Campbell and Knight said in brief: 

 The w^ork consists of a metallographic examination of specimens from the 

 recently discovered cobalt-nickel arsenides and silver deposits of Temis- 

 kaming. The paper contains a series of photographs which show that the 

 minerals were deposited in the following order: smaltite, niccolite, cal- 

 cite, argentite, native silver. The method of examination of opaque minerals 

 along metallographic lines is fully explained. 



All the other papers were discussed at length. 



Mr. Eddy announced the existence of two seismographs in Bayonne, N. 

 J., which had given an average record of 30 shocks annually for the two 

 years during which they were in operation. 



Dr. Kmiz suggested as a possible explanation of the occurrence of the 

 San Francisco earthquake, the overflow and breaking down of the banks 

 of the Colorado River and the consequent filling of the basin at Salton in 

 southern California, where there formerly was an arid, heated depression 

 several hundred feet below sea-level, and there now is an inland sea 

 covering 250 square miles of the lowest point of the sink. Possibly the 



