Will, according to Mr Spencer, is only another aspect of what is reason, memory or feeling - the difference lying in the fact that as will the nascent excitation (ideal motion) is conceived as passing into complete or full motion.
If these spark balls are set at the right distance, then when the potential difference accumulates the antenna will be charged and at some stage suddenly discharged by the discharge leaping across the spark gap. This was Marconi's original method, and the plan is still used under the name of the direct method of excitation or the plain antenna.
In the marsupials it is more evident, and its excitation by electric currents evokes movements in the musculature of the crossed side of the body.
Since the quality of the note sounded depends on the mixture of harmonics, the quality therefore is to some extent dependent on the point of excitation.
Hitherto we were entirely and still are generally confined to electrical excitation or to chemical action as in the case of flames.