226 Scientific Intelligence. 
French Academy of Sciences in March, oe — published in 
= Ixxx, 4 the oo Rendus, gives the s of a series of 
experiments on platinum, in which he assiaied in imitating 
entirely ie platinum hevinig magnetic polarity, by combining 
iron with the metal in fusion. 
Daubrée obec in his introductory remarks, that in wash- 
ing the auriferous sands of the Ural, some gold is left in the 
residue associated with ferruginous grains. To separate the lat- 
e 
made known i o 
set quantity, as if it were a stronger magnet than the native 
magnetite magnets. e presence of 12 t 0 19 per cent of iron 
in this _ of platinum has long been Sigires it having been 
first examined by Berzelius; and Breithaupt made the variety 
a distines: species, calling it ‘es Eisen nplatin.” Gustaf Rose, think- 
ing that the iron present was insufficient to account for the 
magnetic property, supposed that iridium contributed to it. 
n a piece of this iron-platinum weighing twelve grams, Tre- 
ceived from the Ural, Daubrée found three axes and six poles. 
fore proceeding with his experiments for reproducing ‘this 
magnetipolar — pomep ae sought to ascertain what effect 
fusion would have upon the On fusing it there were some 
iron, and a dull surface film was formed. When cooled again, 
r fusion for about one minute, the magnetic property W 
somewhat weakened and polarity was lost, evidently owing to the 
oss 
In his experiments, 24 grams of platinum were fused with 6 
grams of very soft iron wire, the iron being twisted into a cor rd 
and added when the platinum was in full fusion. Immediately on 
the introduction of the iron it was instantly dissolved, giving out, 
making a surface 
bar, each fragment was equally magnetipolar. A very small bar 
was afterward cast; this had energetic poles of ey eee — 
— remained after the sso of scoria ore -deisantne ved. 
ese pol 
apati 
made at the per des Mines, gave iron 16°87, —— 83° set 
99°92. Its ic gravity was 15°66. The specific gravity © 
the second oy 9 was 15°70, ages that in composition ape was 
Others oe were sl with a “- 75 per cent of iron; 
these had no polarity. An alloy with 21-6 per cent of iron, te 
