PROGRESS IN COLOR PHOTOGRAPHY. "215 



blue and two-thirds black. Besides this, the objects appear cut up 

 into a sort of grating, and the effect is rather disagreeable. 



Of all the processes of color photography that have thus far been 

 proposed only the elegant interferential method of Lippmann repro- 

 duces the colors. of the original with absolute fidelity. The indirect 

 method by three negatives in colors, proposed by Charles Cros and 

 Ducos du Hauron, seems to give only an approximate solution of the 

 problem. But the approximation may be practically sufficient, as is 

 shown by the fine transparencies of the Luiniere brothers. This 

 method has, moreover, the advantage that it lends itself to industrial 

 reproductions, as may be seen in the illustrations of M. Prieur. 



It seems, then, that from the practical and industrial point of view 

 a brilliant future is reserved for the ingenius three color method first 

 clearly indicated by the Frenchmen, Charles Cros and Louis Ducos du 

 Hauron. 



