A fluorescent glow appeared on the glass opposite
to cathode The colour of glow of the glass depended on the type of glass,
it  being  yellowish-green for soda glass The cause of this fluorescence
was attributed to the radiation which appeared to be coming from the
cathode These cathode rays were discovered, in 1870, by William
Crookes who later, in 1879, suggested that these rays consisted of streams
of fast moving negatively charged particles