252 Scientific Intelligence. 
ee heat is no longer evolved. If the mixture be then thrown into 
ood-red solution is formed, which, after filtering, contains much 
iecensy : by passing sulphuretted hydrogen for some time into the 
i removed. The d 
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gen. On cooling it becomes brittle, and then yields a violet-brown 
glistening powder which may be — by solution in bisulphid of car- 
bon, filtration and evaporation. The ne sulphid is but slightly soluble 
in alcohol and ether, but is readily aren in bisulphid of carbon with & 
red color. It dissolves in the pure alkalies, as well as their carbonates 
with partial ——— but appears to be taken up by alkaline sul- 
phids without alteration, Concentrated sulphuric acid dissolves it with 
a red color and ae precipitates it from this solution, Nitric acid of 
1:5 attacks it violently and appears to form a new acid. Heated in 4 
closed tube to 100° the new sulphid melts to a tough resin and remains 
in this state after the roaster rises to 150°. Sulphuretted sp 
is then given off. At 200° an amorphous je soci reg, Fo ubli 
further heating anre vikcednans earbon remai Analysis gave | ‘ee 
the new body the formula Cc, S,H. The thor! expla its formation 
by the following equations 
L 2C,$ 4 Natig—2Na0, S,-NaS . Hg8. 
IL. 2NaC 28,-+NaS. HgS+HS=2NaC,S,-+-NaS.HS-+HgS. , 
Ill. 2NaC,S,-+-NaS. a aeeornimnan 
Tl. MINERALOGY AND GEOLOGY. 
1. Recent developments with regard to the Geology of California made by 
he Survey under the direction of Prof. J. D. Wurryey, roe Geologist. 
Remond haa traced the belt of Jurassic rocks, first discovered ou the 
_ Mariposa Estate, as far as the Stanislaus River, ties fossils at several 
localities, the Ancella Erringtoni being the most me 7 although 
pecies of other genera have iond ha probable 3 
that we Shall be able to follow this belt sg ee the Sierra 
t 
( : ; ; 
aa San Franciseo, Jan. 19, 1866 Pacing t abe past summer, Mr. 
] 
] 
‘The results of ~ work in Mica. i during the nt Sa two 
years are quite interestin - will be ; 
Asy x a es wil pen ee i pad oJ a 
3, may be aaa 
