A18 , Seientific Intelligence. 
fracture ; its hardness is not greater than 2, and it polishes under the 
nail, is translucegt on the e edges, and falls to ager when placed in wa- 
ter. Its color is yellowish-green to olive-green. This material is the 
as 
ring in considerable quantities. It is a hydrous siligate of nickel-oxyd, 
allied to the nickel-gymnuite of Genth, but differing from it in containing 
less magnesia and some alumina. One of two concordant analyses, 
executed by Mr. Bonner under fy direction, gave, “ag 33°60, oxyd 
of nickel with a little cobalt 30°40, magnesig 3°55, lime phe alu- 
mina 8°40, peroxyd of iron 2°25, water 17-10=—99- 33. 
. 
SCIENTIFIC INTELLIGENCE.-: 
J. Cuemistry anp Puysics. & 
On the specific volumes of fluid compounds.—Korr has resumed 
his investigation of this very interesting subject and has communicated 
I 
mine dese’ folum ither at the by oiling Paces at temperatures -aqually 
+ i from these and for which the tension o of the vapors is the same. 
- 
in the first place, by the comparison of the specific volumes of a num- 
ber of ethers, as well as of several alcohols and Sere, demonstrates 
ference of specific volume is about 22, In like manner it appears 
that when an organic acid passes into the cotteeponiding th ethyl or 
ethyl ether, a corresponding change of volume of 22 is peoacel thus 
the difference betw 
Formic acid ia ies. of methyl i is ° . a2 
Acetic acid and acetate of methy| is ‘ . 20°4 
Butyric acid and butyrate of methyl “. . ee. ee 
ormic acid and formate of et a $ ‘ iA he 
Acetic acid and acetate of ethyi is ‘- ‘ —. oor 
utyric acid and butyrate of ethyl is : - ~ 210 
The author’s former assumption that fluids of the same empirical form- 
but _d erent rational conan have equal specific volumes | 
| ip,confirmad, & y the following numbers, w which at 
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