Magnetism and Galvanism 
surrounding space became magnetic^ so that bars of steel made 
tangents or sines of circles round the wire dll became magnets^ 
the north pole of one being opposite to the south pole of the 
other. Bj means of a powerful Leyden battery, Sir Humphry 
has made magnets at the distance of fourteen inches from the 
wire. He has also been able to attract and repell bars placed 
in the voltaio circuit by the common ifpagnet. We wait with 
mitch impatience for the publication of this interesting paper^ 
which was read at the Royal Society on the 16th November. 
Account of Amperds Experiments. 
'This eminent mathematician has communicated to the Aca-* 
demy of Sciences three memoirs, on the 18th and 25th Septem-* 
her, and the 30th October 1820. The second of these me- 
moirs is entitled “ Sur Taction mutuelle de deux Courans elec^ 
triques, sur celle qui existe entre un courant electrique et un 
aimant) et celle de deux aimans Tun sur TaulreT^ The foL 
lowing are the principal conclusions deduced from this memoir. 
1. ‘‘ Two electric currents attract one another when they move 
parallel and in the same direction, and they repell one anothep 
when they move parallel and in opposite directions. 
2. It follows, therefore, that when the metallic wires through 
which these currents are transmitted, can only turn in parallel 
planes, each of the two currents tends to bring the other into 
a situation where it may be parallel to it, and in the same di- 
rection. 
3. These attractions and repulsions are absolutely different 
from the attractions and repulsions of ordinary electricity. 
4. All the phenomena discovered by Mr Oersted, and which 
I analyzed, and reduced to two general facts in my first me- 
moir, are embraced by the law of the two electrical currents, 
(§ 1.), admitting that a magnet is only an assemblage of elec- 
trical currents, produced by the mutual action of the particles of 
steel, analogous to that of the elements of a Voltaic pile, and 
which move in planes perpendicular to the line which joins the 
two poles of the magnet. 
5. When the magnet is in the situation which it tends to 
take by the action of the terrestrial ^agnet, these currents have 
a direction opposite to that of the apparent motion of the sun, 
