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arisen. The additions which it must receive are in the region of photo- 
magnetic or photo-electric manifestations as evidenced by the Zeeman 
effect and the connection existing between ionization and light centers. 
Perhaps some investigator in the field of electro-magnetic oscillations 
will be able some day to devise an oscillator of such frequency that not only 
will he be able to produce radiant heat but run the gamut of a photo- 
chromatic scale not of sounds and their overtones and harmonies but create 
for us the gorgeous colors of a sunrise or a sunset; or perhaps there may 
arise a counterpart of modern orchestral music executed not in a coneord 
of harmonious sounds but of color, with shades and tints more marvelously 
beautiful than any the human mind has yet conceived. 
