If Light, then, consists of waves transmitted through the ether, what
gives rise to the waves? Whatever sets up such wonderfully rapid series
of waves must be something with an enormous vibration. We come back to
the electron: all atoms of matter, as we have seen, are made up of
electrons revolving in a regular orbit round a nucleus. These electrons
may be affected by out-side influences, they may be agitated and their
speed or vibration increased.