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FARADAY. 343

all the ages of the human race—Nature will find room for
both the philosophical experimenter and the mathematician.
Faraday entered his protest against the foregoing statement
by labelling his investigations “ Experimental Researches
in Electricity.” They were completed in 1854, and three
volumes of them have been published. For the sake of
reference he numbered every paragraph, the last number
beng 3,362. In 1859 he collected and published a fourth
volume of papers under the title, “ Experimental Researches
in Chemistry and Physics.” Thus the apostle of experi-
ment magnified his office.

The second volume of the Researches embraces memoirs
on the Electricity of the Gymnotus; on the Source of Power
in the Voltaic Pile ; on the Electricity evolved by the Friction
of Water and Steam, in which the phenomena and principles
of Sir William Armstrong’s Hydro-electric machine are
described and developed; a paper on Magnetic Rotations,
and F araday’s letters in relation to the controversy it
aroused. The contribution of the most permanent value
here is that on the Source of Power in the Voltaic Pile. By
it the Contact Theory, pure and simple, was totally over-
thrown, and the necessity of chemical action to the main-
tenance of the current demonstrated.

The third volume of the Researches opens with a me-
moir entitled, “ The Magnetization of Light, and the Illu-
mination of Magnetic Lines of Force.” It is diflicult even
now to affix a definite meaning to this title; but the dis-
covery of the rotation of the plane of polarization which it
announced seems pregnant with great results. The writ-
ings of William Thomson on the theoretic aspects of the
discovery; the excellent electro—dynamic measurements of
Wilhelm Weber, which are models of experimental com-
pleteness and skill ; Weber’s labors in conjunction with his
lamented friend Kohlrausch—above all, the researches of
Clerk Maxwell on the Electro—magnetic Theory of Light—-

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