394 E. S. Holden — Earthquakes in California. 



Boston, Massachusetts. The Lick Observatory also possesses a 

 seismometer invented by Professor Milne and kindly presented 

 by him, which is designed to serve for general purposes. We 

 have not thoroughly tested this as yet. It is simple in construc- 

 tion, and inexpensive. A description of it may be found in 

 Trans. Seis. Soc. of Japan, vol. xii. 



The instruments above named which are in California have 

 been visited and adjusted by Mr. Keeler of the Observatory 

 (who is in charge of our earthquake instruments), and the 

 owners of these instruments have kindly reported the occur- 

 rence of shocks, and have often sent blue prints or tracings of 

 the records made. The reports of Mr Jaiboe, Mr. Blinn, and 

 Mr. Burckhalter have been especially full, as will be seen from 

 what follows. Wm. Irelan, Esq., Dr. J. B. Trembley of Oak- 

 land, and U. S. Surveyor General Irish of Nevada, have kindly 

 taken the pains to send accounts of all shocks. 



I have also copied from such newspapers as fell under my eye 

 all data respecting California earthquakes. These are given 

 in what follows, together with the results obtained from the 

 various instruments. To make this record complete the reports 

 of the IT. S. Light House Board, of the IT. S. Geological 

 Survey, and the annual records of earthquakes given by 

 Professor Rockwood in this Journal should be consulted. As 

 these are available to all, I have not reprinted any data from 

 them. It is intended in future years to continue such records 

 as the present one. The extremely local character of some of 

 these shocks is noteworthy. 



Earthquakes in California, 1888. 



1888, January 7, 10:25 p. m.— S. F. (II) : Berkeley (IV),— 

 at Berkeley a loud explosion. — Professor Kellogg. 



January 13, at night. — Berkeley, a slight shock (N.E.-S.W.) 

 recorded on duplex seismometer (I ? II ? Ill ?). — Professor 

 Soule. 



January 16, 11:39 P. M. — S. F.: single, short, sharp shock 

 (IV). — E. S. H. (I have no other report of this, and it must 

 therefore be regarded as doubtful.) 



January 17, 10:10 P. M.— S. F.— E. E. Barnard. Oakland, 

 from N.E. to S.W. (III? I V ?).— Prof essor Edwards. 



January 26, % — Healdsburg, 10 sec. duration, S. F. Chronicle, 

 Jan. 28. (Total eclipse of the moon on January 28.) 



January 29, 10:35 p. M. — Carson, Nevada, a slight shock 

 (IV to V) Grass Valley, Cal.: the same shock (II). — Grass 

 Valley Tidings, Feb 3. 



January 30, 4:15 A. M. — S. F. [not reported in newspapers]. — 

 J. R. J. 



