ungsten added. It
varies a good deal in composition according to manufacture, and the
resistivity of different specimens is not identical. Its electric
properties were first made known by J. T. Bottomley, in a paper read
at the Royal Society, May 5, 1885.

[10] An equivalent gramme molecule is a weight in grammes equal
numerically to the chemical equivalent of the salt. For instance, one
equivalent gramme molecule of sodium chloride is a mass of 58.5
grammes. NaCl = 58.5.

[11] F. Kohlrausch and L. Holborn, _Das Leitvermogen der Elektrolyte_
(Leipzig, 1898).

[12] It should be noticed that the velocities calculated in
Kohlrausch's theory and observed experimentally are the average
velocities, and involve both the factors mentioned above; they
include the time wasted by the ions in combination with each other,
and, except at great dilution, are less than the velocity with which
the ions move when free from each other.

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