230 H. Becquerel—Magnetic Properties of Nickeliferous Iron. 
It is apparent, in the first place, that in the natural state, the 
small bar of St. Catarina iron is very much less magnetic than 
the Swedish iron. When the former was heated to 230°, it 
. ° aa o 
To study this iron under conditions more or less removed 
from its magnetic saturation, two other little bars were experi- 
mented with. 
Ber Npreadth, 4inm.; thiekiess ona. Bar eadth, aos mins thickness 13 mun. 
atural Heated to Rela- Natural Heatedto Rela- 
Intensity state. redness, tion. Intensity. state. redness. tion. 
071525 17 (2) 36 he) Sea eerie ot ere - = 
0°3000 130 26 0°3020 1°8(2) 41° 23°(?) 
05600 16 407 25-4 0°56 5° 23 24°6 
0°8100 749 24-9 0°8141 9°5 229 2471 
The native iron of St. Catarina has been carefully studied 
y M. Damour and MM. Daubrée and Meunier, who have 
attributed to it a meteoric origin, and who have found that it 
contained about 34 per cent of nickel. The remarkable effect 
manifested when it is heated appears to be due principally to 
the presence of nickel and a crystallization effected at a very 
low temperature. 
I therefore undertook a series of experiments, to see whether 
pure iron and pure nickel crystallized in the cold did not 
exhibit the same property. To try this, small cylinders of 
iron and nickel were prepared by depositing these metals upon 
a platinum wire by electrolysis. The deposit took place slowly 
at the ordinary temperature, and the deposited metals were 
crystallized. ‘The bars were studied by the aid of the balance, 
then heated to redness and re-examined. ‘The iron in the con- 
ditions under which I operated presented after heating n° 
notable change in its magnetic properties. This was not true 
of the nickel crystallized in the cold, for it presented after the 
heating a considerable augmentation of its magnetic property. 
The following are some of the results obtained with this metal : 
