in these cases exert a mutual influence upon each other, and
that to this must be ascribed the cause of the phenomena which
they show by their combination or contact.

After discussing some of the experiments on nerve stimulation
which had been made by Galvani and others, Fabroni argues that
these are principally, if not wholly, due to chemical action,
and that the undoubted electrical phenomena which sometimes
accompany them are not the cause of the muscular contractions.

In discussing the nature of the chemical changes produced in
two metals by their mutual contact, Fabroni says:

'Since the metals have relationships with each other, the
molecules must mutually attract each other as soon as they come
into contact. One can not determine the force of this
attraction, but I believe it is sufficient to weaken their
cohesion so that they become inclined to go into new
combinations and to more easily yield to the influence of the
weakest solvents.'

In order to further show the weakening of cohesion by the
contact of two metals, Fabroni describes the results of some
experiments which he has made. He says:

'In order to assure myself of the truth of my assumptions, I
put into different vessels filled with water:

(1) Separate pieces, for example, of gold in one, silver in
another, copper in the third, likewise tin, lead, etc.