---- ---- ---- as glow 1526
---- ---- ---- dark 1544
---- P 10. Convection; or carrying discharge 1562
---- P 11. Relation of a vacuum to electrical
phenomena 1613
S. 19. Nature of the electric current 1617
---- ---- its transverse forces 1653
Series XIV. S. 20. Nature of the electric force or forces 1667
S. 21. Relation of the electric and magnetic
forces 1709
S. 22. Note on electrical excitation 1737
Index
Notes

EXPERIMENTAL RESEARCHES
IN
ELECTRICITY.

FIRST SERIES.

S 1. _On the Induction of Electric Currents._ S 2. _On the Evolution of
Electricity from Magnetism._ S 3. _On a new Electrical Condition of
Matter._ S 4. _On_ Arago's _Magnetic Phenomena._

[Read November 24, 1831.]

1. The power which electricity of tension possesses of causing an opposite
electrical state in its vicinity has been expressed by the general term
Induction; which, as it has been received into scientific language, may
also, with propriety, be used in the same general sense to express the
power which electrical currents may possess of inducing any particular
state upon matter in their immediate neighbourhood, otherwise indifferent.
It is with this meaning that I purpose using it in the present paper.

2. Certain effects of the induction of electrical currents have already
been recognised and described: as those of magnetization; Ampere's
experiments of bringing a copper disc near to a flat spiral; his repetition
with electro-magnets of Arago's extraordinary experiments, and perhaps a
few others. Still it appeared unlikely that these could be all the effects
which induction by currents could produce; especially as, upon dispensing
with iron, almost the whole of them disappear, whilst yet an infinity of
bodies, exhibiting definite phenomena of induction with electricity of
tension, still remain to be acted upon by the induction of electricity in
motion.

3. Further: Whether Ampere's beautiful theory were adopted, or any other,
or whatever reservation were mentally made, still it appeared very
extraordinary, that as every electric current was