24 EARTHQUAKES ON THE PACIFIC COAST 



to San Francisco, and another line on the east side of the bay, 

 would be required. A few years' observations carefully studied 

 would, I think, bring out results of consequence. The basin of 

 Clear Lake should be studied in the same way, as its shocks appear 

 to be of a special class. 



Eepoeted Volcanic Eruptions on the Pacific Coast. 



The list of shocks printed in 1887, and those compiled during 

 succeeding years, contained many reported " eruptions " of moun- 

 tains in the Puget Sound region. For a number of years I made it 

 my business to apply by letter to intelligent observers in that 

 neighborhood to determine whether Mount Baker and other moun- 

 tains had ever certainly been known to be in eruption. Clouds 

 hanging over the summit, snow blown from the slopes, etc., might, 

 in my own opinion, account for all the reported phenomena. Still 

 it was not possible to be certain either way, and I have left the 

 accounts of such eruptions as they were first printed. 



In 1896 Mr. Frederick G. Plummer, C. E., was kind enough to 

 copy from his papers a list of the eruptions of Alaska volcanoes 

 (1690 to date) and of the reported eruptions of the mountains 

 around Puget Sound. This list was printed in the Publications 

 of the Astronomical Society of the Pacific and is reprinted here. 

 I have not incorporated this data in the catalogue of earthquakes 

 which follows; it is more convenient in its present shape. Particu- 

 lar attention is called to the introductory paragraphs of Mr. Plum- 

 mer's valuable list. Eeports in the newspaper press on this subject 

 are never decisive. To establish the fact of an eruption of one of 

 the Puget Sound volcanoes it is necessary to have the report of an 

 expert who was on the spot. 



Eeported Volcanic Eruptions in Alaska, Puget Sound, etc., 



1690 to 1896. 



BY FREDERICK G. PLUMMER. 



Tacoma, Washington, March 13, 1896. 



" There can be no doubt that many eruptions are reported which 



might be contradicted if examination were possible. For example, 



the reports of the eruption and change in the summit of Mount 



Tacoma from November 21 to December 25, 1894, filled many 



