EARTHQUAKES ON THE PACIFIC COAST 115 



1886. October 15; 

 Fort Point Lighthouse, S. F., Cal., 9.59 p. m.; Mare Island Light- 

 house. Cal., 10 hours, Vs minute, p. m.— Report of L. H. Board for 

 1885-6. 10.05 p. m., S. F., Cal. (IV).— T. T. 



1886. November 11; 7:11 p. m.; III. 



Slig-ht shock at San Francisco. — A. S. 



1886. December 6; IV. 



San Francisco; also Santa Cruz. — A. S. 



1887. January 3; 4:29 p. m. 



Humboldt Lighthouse, Ca\.—Rep(n-t of L. E. Board for 1885-6. 



1887. January 8; 2:20 a. m. 



Cape Mendocino Lighthouse, Cal. — Repo^rt of L. H. Board for 1885-6. 



1887. January 11; 4:11 a. m. 



Fort Point Lighthouse, S. F., Cal. Pigeon Point Lighthouse, Cal., 

 4 a. Txx.—Report of L. H. Board for 1885-86. 4.10 a. m., S. F., Cal.— 

 T. T. Two shocks.— A. S. 



1887. January 15; 10:58 p. m. 



Point Arena Lighthouse, Cal. — Report of L. H. Board for 1885-6. 



1887. January 19; 3:15 a. m. 



Point Arena Lighthouse, Cal. — Report of L. H. Board for 1885-6. 



1887. January 19; 10:25 p. m. 



Mare Island Lighthouse, Cal. — Report of L. H. Board for 1885-6. 



1887. January 31; 

 Sharp shock at Bakersfield, Cal. — A. S. 



1887. April 24; nig^bt; II. 



Slight shock recorded on seismometer of Lick Observatory. 



1887. April 29: 



Shocks in Walla Walla Valley, W. T.— A. S. 



1887. May 3; II. 

 Slight shock recorded on seismometer at Lick Observatory. 



1887. May 3; 2:48 p. m. 



I have no record of this shock at Fort Yuma, but I assume it to 

 have been felt there. In Science, 1887, May 20, p. 483, under the 

 heading. The Sonora Earthquake, is a good account by G. E. Good- 

 fellow^, of the shock at Tombstone, Arizona. At this place there 

 M'ere loud detonations. The severe shaking" lasted 10 seconds, the 

 moderately severe about 20, and tremors a little over one minute. 

 Xo building of any stability was damaged, and no person was 



