i , ea ree 
Chemistry and Physics. 387 
it is positive or se ive. 
The shorter end of the siphon dips in a vessel of water, and the 
larger end is drawn out to a point, so that, owing to capillarity, 
no water will flow. Thewater level ma then be _— or a ed 
tricity, and there is no flow when the source is negative. The 
traversed by a current ought to be usar age e direction of 
: , if their velocities are comparab He employs an 
rrangement like the interferential a aan of Arago, and 
finds that there is no pares action.—J/ nuovo Cimento, ix, 97, 
148 ; Journ. des Phys., iii, 227. E, 
10. Note on the view Be Mallet t as to the Fusion of Metals ; by 
LF Scumipr, of the Missouri Geological Survey. (Communi- 
mad )—This Journal for September mentions a paper read by Mr, 
R. Mallet, before the Royal Society, on the fusion of metals. In 
that paper the author is said to have explained the fact that some 
metals, when solid, float on a melted bath of the same metal, by 
La 
ave a solid ball of cast-iron of 15 to 2 pei ee Ree 
and filed off pretty smoothly. Have a ladle or vessel of at least 
at th 
Mr. Mallet, will sink te the bottom of the ladle at once. Dibied an 
yen that cast-iron at ordinary tem ai peeataces is both heavier and : 
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solid iron expands, and becomes lighter and finally floats on the 
molten iron. The latter fact shows simply siting. solid iron, when 
