418 Scientific Intelligence. 
be observed, however, that the presence of lead, silver, arsenic and 
many other ‘substances i in copper ores would render the method inap- 
p icable in its present form.—w. Gc. 
metallic Uranium.—Per.icot has presented to the Academy 
of Gitdainie: some specimens of uranium fused at a high temperature. 
The author employed sodium as a reducing agent and proceeds as fol- 
lows. A quantity of sodium is introduced into a hee crucible 
and covered with very dry chlorid of potassium and then w 
ture of this salt and the green chlorid of uranium. The porcelain cru- 
cible is then to be placed within one of clay, the intervening space 
filled with charcoal dust, and the outer idle a The 
crucible is then heated till the reaction takes place, which is known by 
the noise heard at the moment; it is then to be placed in a furnace 
and heated to a red-white heat for fifteen or twenty minutes. On cool- 
ing, there is found in the crucible a scoria containing globules of fused 
uranium. As thus prepared, the metal has a certain malleability ; its 
color recalls that of nickel or iron. In the air it assumes a yellowish tint 
from superficial oxy dation. Heated to redness it becomes suddenly 
4, 
ium?) and gold it is the heaviest body known. The author proposes 
to continue the study of this metal which appears to possess interesting 
properties.— Comptes Hendia: xlii, 73, Jan. 1856. 
12. On crystallized silicon ae carbon.—WO6xLER has found that by 
fusing aluminium with an excess of fluosilicate of potassium, 3KF, 
plates with anally lustre. pine node Rendus, xlii, 48. 
13. On Ozone and Ozonic ae in Mushrooms; by M. ScHoNnBEIN, 
in a letter to M. Faraday, (Phil. Mag., [4] vol. xi, p. ‘gy, Feb. 1856.)— 
You know that I hold oxygen, both in its free and bound state, to be 
capable of existing in two allotropic modifications,—in the ozonic OF 
active, and the ordinary or inactive condition. All the oxy- -compounds 
yielding common oxygen at a raised temperature 1 consider to contain 
ozonized oxygen; and 1am further inclined to believe that the disen- 
ement of common oxygen from those compounds de depends upon the 
transformation of the ozonized oxygen into the inactive one, or, to de- 
note that allotropic change, of O into 0. Nowa general fact is this: 
that the oxygen thus set free te re traces of O more or less, 
according to the degree of tempera’ at which the oxygen happens 
to be disengaged from those sleek sre The lower that degree, the 
the quantity of O mixed with O; though I must not omit to 
pg that in all cases that quantity happens to to be pe ennent ngly small in 
comparison to that of O obtained at The best means 
