attention from various philosophers, to all of whom I am obliged, and some
of whose corrections I have acknowledged in the foot notes. There are, no
doubt, occasions on which I have not felt the force of the remarks, but
time and the progress of science will best settle such cases; and, although
I cannot honestly say that I _wish_ to be found in error, yet I do
fervently hope that the progress of science in the hands of its many
zealous present cultivators will be such, as by giving us new and other
developments, and laws more and more general in their applications, will
even make me think that what is written and illustrated in these
experimental researches, belongs to the by-gone parts of science.

MICHAEL FARADAY.

Royal Institution,
March, 1839.



CONTENTS.

Par.
Series I. §. 1. Induction of electric currents 6
§. 2. Evolution of electricity from magnetism 27
§. 3. New electrical state or condition of matter 60
§. 4. Explication of Arago's magnetic phenomena 81
Series II. §. 5. Terrestrial magneto-electric induction 140
§. 6. Force and direction of magneto-electric
induction generally 193
Series III. §. 7. Identity of electricities from different
sources 265