THE BANISHMENT OF NIGHT 



familiar with Mr. Hewitt's work will not be surprised 

 any day to hear that he has finally overcome all obstacles, 

 and produced a perfectly white light. In the meantime 

 the relatively expensive arc light and the incandescent 

 bulb with its filament of carbon or metal hold unchal- 

 lenged supremacy in the commercial field. 



VOL. VI. 16 



[241] 



