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"Do the pith-balls diverge by the disturbance of electricity through mutual induction or not?"

It becomes especially marked in a coil of wire, in which the adjacent turns act inductively upon each other upon the principle of mutual induction arising between two separate adjacent circuits.

Induction between circuits occurs because the circuits possess inductance; it is called mutual induction.

This helpful action of mutual induction is present in all long circuits, and it is the reason why we were able to speak to Brussels and even to Marseilles.

In this discovery Henry anticipated Faraday though his results as to mutual induction were not published until he had heard rumors of Faraday's discovery, which he thought to be something different.