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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 harmonics 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 concord 

 of harmonious sounds but of color. Avith shades and tints more marvelously 

 beautiful than anv the human mind has vet conceived. 



