an extract from my note-book, dated November 28, 1825: "Experiments on
induction by connecting wire of voltaic battery:--a battery of four
troughs, ten pairs of plates, each arranged side by side--the poles
connected by a wire about four feet long, parallel to which was another
similar wire separated from it only by two thicknesses of paper, the ends
of the latter were attached to a galvanometer:--exhibited no action, &c.
&c. &c.--Could not in any way render any induction evident from the
connecting wire." The cause of failure at that time is now evident
(79.).--M.F. April, 1832.




SECOND SERIES.

THE BAKERIAN LECTURE.


§ 5. _Terrestrial Magneto-electric Induction._ § 6. _Force and Direction of
Magneto-electric Induction generally._

Read January 12, 1832.


§ 5. _Terrestrial Magneto-electric Induction._

140. When the general facts described in the former paper were discovered,
and the _law_ of magneto-electric induction relative to direction was
ascertained (114.), it was not difficult to perceive that the earth would
produce the same effect as a magnet, and to an extent that would, perhaps,