ACADEMY OF NATURAL SCIENCES. 149 



1859. 



January 25th, 20h. 20m. — A heavy shock of earthquake was felt in Trinity 

 and Shasta counties. It was felt at Weavcrville, Shasta, and Horsetown. 



April 4th, 13h. — Quite a severe shock was felt at San Jose. There were several 

 vibrations, apparently from north to south. 



August 10th, 22h. 35m. — A smart shock was felt in this city (San Francisco). 



September 26tb, 6h. 10m. — A smart shock at San Francisco. 



October 5th, 13h. 18m. — A very smart shock at San Francisco. 



November 27th, 19h. 15m. — A light shock at San Francisco. 



December 1st, Oh. 50m. — A smart shock at San Francisco. Felt at Oakland 

 and Benicia. 



December 1st, 14k. 10m. — Several successive shocks were felt at San Bernar- 

 dino ; several of them were quite heavy, causing much alarm. No damage 

 was done. 

 Whole number of shocks during this year was eight. 



1860. 



During the year last past this portion of the Pacific coast has been but 



little disturbed by earthquakes. There have been but three during this period 



that can be well authenticated, and one, viz. : December 21st, whose character 



is somewhat doubtful. 



The shocks that have occurred are as follows : 



March 27th. — A severe shock was experienced at Los Angeles and vicinity, 

 which was not productive of any damage to person or property. No time is 

 given in the account. 



March 15th, llh.— A violent shock was experienced at Sacrameuto ; the wave 

 passed through the counties of Placer, Nevada, El Dorado and Plumas. At 

 Iowa Hill the church bells were rung, also at Sacramento. At the latter 

 place and at Forest City, clocks, iu many of the buildings, were stopped. 

 This earthquake extended to the eastern base of the Sierra Nevada. At 

 Carson City it occurred at 10b. 45m. and very violent ; goods were shaken 

 off the shelves in many of the stores, and a general panic and stampede pre- 

 vailed. 



November 12th. — A smart shock was felt at Humboldt Bay and its vicinity, 

 but no damage was done. 



December 21st, 6h. 30m. — At San Francisco a series of light vibrations of the 

 earth occurred, which continued with but two remissions for the space of half 

 an hour. These vibrations were not perceptible to persons in the building 

 otherwise than by mercurial column, which was equal to seven inches of the 

 barometer, and was the mercury gauge of an air pump that had remained 

 stationary at twenty-four inches for the space of four hours. At this time 

 the column in the gauge began to show much disturbance by oscillating up 

 and down in a very rapid manner without any apparent cause ; the stop 

 screws (Faraday's) were all tried at the moment and found perfectly tight 

 as they had remained for hours previous. 



