ugh ee 4 
J. B. Trask on Earthquakes in California. «B41 
OXYD OF LUTEOCOBALT. : 
‘The oxyd of Luteocobalt may be obtained by decomposing a 
solution of the sulphate with ‘baryta water. The solution is 
rown-yellow, and has an alkaline taste and reaction. It cannot 
i. 
(Zo be concluded.) we 
[hoe sitters ee 
Arr, XXXIV. —Farthquakes in California during the year 1856 ; 
by Dr. J. B. Trask.* 
_Ar the close of 1855, I presented to the Association a state- 
Ment of the occurrence of earthquakes in this state for that year 
and a term of years preceding. 
for which were so obscure as to render it im 
ble to determine with accuracy the precise ier of their occur- 
ence. So far as I am informed, those shocks which have taken 
Place in this State during the past year have not been marked 
with more severity than has been usual in years preceding. They 
frequently amounted to a slight tremor, and at other times to 
8Tound, and in the more retired of the =a on the allu- 
ras The total number for the past year is sixteen, and of this num- 
ber thirteen were observed between sunset and sunrise, a fact 
,* Read before the California Academy of Natural Sciences, at San Francisco, 
January 12, 1857, . 
