s far to justify the expectation.
In this point of view I think it very likely that plates of platina or
silver may be used instead of plates of copper with advantage, and that
then the evil arising occasionally from solution of the copper, and its
precipitation on the zinc, (by which the electromotive power of the zinc is
so much injured,) will be avoided (1047.).

P iv. _On the Resistance of an Electrolyte to Electrolytic Action, and on
Interpositions._

1007. I have already illustrated, in the simplest possible form of
experiment (891. 910.), the resistance established at the place of
decomposition to the force active at the exciting place. I purpose
examining the effects of this resistance more generally; but it is rather
with reference to their practical interference with the action and
phenomena of the voltaic battery, than with any intention at this time to
offer a strict and philosophical account of their nature. Their general and
principal cause is the resistance of the chemical affinities to be
overcome; but there are numerous other circumstances which have a joint
influence with these forces (1034. 1040. &c.), each of which would require
a minute examination before a correct account of the whole could be given.

1008. As it will be convenient to describe the experiments in a form
different to that in which they were made, both forms shall first be
explained. Plates of platina, copper, zinc, and other metals, about three
quarters of an inch wide and three inches long, were associated together in
pairs by means of platina wires to which they were soldered, fig. 88, the
plates of one pair being either alike or different, as might be required.
These were arranged in glasses, fig. 89, so as to form Volta's crown of
cups. The acid or fluid in the cups never covered the whole of any plate;
and occasionally small glass rods were put into the cups, between the
plates, to prevent their contact. Single plates were used to terminate the
series and complete the connexion with a galvanometer, or with a
decomposing apparatus (899. 968. &c.), or both. Now if fig. 90 be examined
and compared with fig. 91, the latter may be admitted as representing the
former in its simplest condition; for the cups i, ii, and iii of the
former, with their contents, are represented by the cells i, ii, and iii of
the latter, and the metal plates Z and P of the former by the similar
plates represented Z and P in the latter. The only difference