Geology. 



113 



in the general disturbance that prevailed upon our own shores during the 

 period above named. 



With the 26th of January ceased the vibrations on this coast at that 

 time, (that were perceptible without the use of instruments) : but it ap- 

 pears that shocks continued much later on the east coast of China and 

 Australia, extending into the month of February. 



1853. Jan. 2. — A smart shock felt in Mariposa, and at the same time 

 in San Francisco, Shasta City, and Bodega. 



Jan. 5. — A shock at Corte Maderia. 



Feb. 14. — A light shock at San Luis Obispo. 



March 1. — A smart shock at San Francisco, felt at San Luis Obispo 

 and Santa Barbara. 



April 24. — A light shock at Humboldt Bay. 



April 26.— Three shocks at Weaverville. 



June 2. — Two smart shocks on the plains of the San Joaquin. 



July 12. — A light shock in Yreka, Siskiyou Co. 



Sept. 3. — Four shocks on the San Joaquin and Salinas Plains. 



Oct. 23. — Three heavy shocks at Humboldt Bay. 



Oct. 25. — A light shock at Humboldt Bay. 



Nov. 16. — A light shock at San Jose. 



Nov. 21. — A shock at San Francisco. 



Dec. 11. — A light shock at San Francisco and Mission Dolores. 

 Dec. 23. — A light shock at Shasta City. 

 Total number recorded in 1853 is fifteen.. 



1854. Jan. 3. — Two smart shocks in Mariposa, and felt at the same 

 time in Shasta. 



March 2. — A light shock in San Francisco. 

 March 20. — A shock in Stockton. 

 April 29. — A light shock at Santa Barbara. 

 May 23. — A shock at Crescent City. 



May 31. — An earthquake at Santa Barbara, at 10 minutes before 5 

 o'clock in the morning. There were three vibrations, the first of which 

 was accompanied with a deep rumbling ; the second was preceded by a 

 loud rushing sound, like the approach of a strong wind. About four or 

 five seconds elapsed between each shock. The sea was much disturbed, 

 and a heavy surf swell came in soon after the second shock was felt, 

 which passed some thirty feet beyond the old wreck near the embarca- 

 dero. The inhabitants left their beds in their night attire, and sought the 

 street. But little damage was done. 



June 26. — Two light shocks in Placer county. 



July 10. — One shock at Georgetown. 



July 14. — One shock at Georgetown. 



Sept. 14. — A light shock at Nevada. 



Oct. 21. — A light shock at Monterey. 



Oct. 26. — A smart shock at San Francisco, felt also at Benicia. Ves- 

 sels lying at the wharves worked heavily on their hawsers. 

 Total number of earthquakes in 1854 is twelve. 



Earthquakes during the year 1855. — The following is the record of the 

 number of earthquakes that have occurred during 1855 in the State of 

 California, with the date and hour of the day at which they were observed. 



SECOND SERIES, VOL. XXII, NO. 64. — JULY, 1856. 15 



