H. Becquerel— Magnetic Properties of Nickeliferous Iron. 231 
Nickel deposited by the pile. | 
First bar.— Weight 2-442 gr.; length 40 mm. Second bar.— Weight 4-484 gr.; length 50 mm. 
Not ela- Ni Reia- 
Intensity. heated. Heated. tion. Intensity. heated. Heated. tion. 
071500 34 mer 216 mer 6°37 0°1708 80°56 mst 434 MEt 5°39 
0-3000 147 589 4-00 0°2885 320°5 1010 3°15 
04200 310 909 2°93 0°5480 1132°5 2313 2°04 
075900 5 1363 2°33 0°T758 1982°5 3470 1:75 
589 24 
08500 1103 2043 DRG ehite eae ae pats, oa eae 
The bars that were examined contained in their axes a 
platinom wire, thus forming a kind of tube; and as their 
section is small compared with their length, they are much 
nearer their point of magnetic saturation than the bars of 
native iron already examined. In regarding the rapid increase 
of the relation as recorded in the last column of the above 
tables, when we recede from the point of saturation, we recog- 
nize that the increase of the magnetic properties of the nickel 
crystallized in the cold is of the same order of phenomena 
as that observed in the St. Catarina iron. 
It might be imagined, that on forming with the native metal 
bars such as No. 2 and No. 8, of which the sections are smaller 
and smaller in relation to their length, that we approximate to the 
Magnetic saturation and would obtain numbers nearer to those 
which were found for the nickel in the condition of the preced- 
ing experiments; but on the contrary, in the case of these two 
bars, the magnetic relations before and after the heating is 
_ greater for the second than for the first. If the facts be con- 
sidered which I have established in the memoir previously re- 
ferred to, it will be recognized that the characteristics presen 
by the St. Catarina iron indicate that the magnetic conditions 
to which it has been submitted are far removed from those of 
Saturation. 
The magnetic capacity of nickel is greater in proportion to 
the distance the molecules of this metal are removed from 
each other; it therefore tends to become equal and even a little 
erty of this metal; in fact observation proves that after the 
heating of the nickel which accompanies the iron, the nickel be- 
haves like the iron. The crystalline condition of the native 
‘ron not reheated appears as in the pure nickel to be the cause 
which opposes the magnetic manifestations. 
. ‘Ve necessarily conclude from this research that the native 
'ron from St. Catarina has been crystallized at a low tempera- 
ture. This conclusion does not permit of forming a correct 
hypothesis of the meteoric or terrestrial origin of the iron. 
Am. Jour, is ieee Series, Vou, XXIII, No. 135.—Marcu, 1882. 
Es 
