ACADEMY OF NATURAL SCIENCES. 137 



March 1st.- — A smart shock at San Francisco, which was felt at San Luis 



Obispo and Santa Barbara. 

 April 24th.— A light shock at Humboldt Bay. 



April 25th. — Three shocks in quick succession at Weaverville, Trinity County. 

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

 July 12th. — A light shock at Yreka, Siskiyou County. 

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

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

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

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

 Nov. 21st. — A shock at San Francisco. 



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

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



Total in 1853, 15. 



1854. 



Jan. 3d. — Two smart shocks in Mariposa, felt also in Shasta. 



March 2d. — A light shock at San Francisco. 



March 20th. — A shock at Stockton. 



April 29th. — A light shock at Santa Barbara. 



May 23d. — A shock at Crescent City. 



May 31st. — An earthquake at Santa Barbara at 5h. 10m. In this earthquake 

 there were three distinct waves. The first was accompanied by profound 

 rumbling ; the second shock was preceded by a loud, rushing noise 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 passed. This surf-wave rolled inland some thirty feet 

 beyond the old wreck at the embarcadero. I saw the effect of this wave in 

 July following. The inhabitants were much frightened and left their beds 

 for the open air. Very little damage was sustained. 



June 2Gth. — Two light shocks in Placer County. 



July 10th. — One shock at Georgetown. 



July 14th. — A shock at Georgetown. 



Sept. 14th. — A light shock at Nevada. 



Oct. 21st. — A light shock at Monterey. 



Oct. 2Cth.— A smart shock at San Francisco, near midnight. It was felt at 

 Benicia. This shock was followed by a swell in the bay, as vessels at the 

 wharfs swayed heavily on their hawsers. 



Total in 1854, 12. 



1855. 



The following is the record of earthquakes for this year, in the State of Cali- 

 fornia, with the date and hour of the day at which they were observed : 

 Jan. 13th, 18h. 30ra. — A smart shock occurred at San Benito and San Miguel. 



It was felt at San Luis Obispo. 



