1
This effect is called an electro-magnetic disturbance in the ether.
2
Light is an electro-magnetic disturbance of the ether.
3
In other words, if light is an electro-magnetic disturbance, all conducting substances must be opaque, and all good insulators transparent.
4
In 1865, two years before Faraday's death, Maxwell proposed the electro-magnetic theory of light, showing that light is an electro-magnetic disturbance.