316 COLOR PHOTOGRAPHl. 



the dift'erence is not of immediate iiiiportiincc^ to us in photooraph}^ 

 that 1 see. The at-tinic planes were proved by Wiener to exist. 

 Lippmann turned them to vital aceount for us, and gave us, in the wa}' 

 we all know, true eolor photography. He used thick lihns for the 

 express purpose of securing" what Wiener desired to avoid, reduplica- 

 tion of the actinic planes, and with them the strong creation of color. 

 Here are some of the most exquisite results of his process. I owe 

 them to Dr. Neuhauss, who kindly supplied me with a spectrum and a 

 vivid picture from what I may call still life, and to Mr. Senior, who 

 has placed his l)est specimens of a spectrum with the Frauenhofer 

 lines at my disposal for your service. A more precious one than an}^ 

 of these is this given me by Dr. Lippmann himself, a tribute to my 

 father's memory as a pioneer of photography, which I shall be happy 

 to show afterwards. It is the simple naked tilm itself. 



Before parting with Lippmann's process I feel sure that you will 

 like to see the decisive evidence obtained by Dr. Neuhauss of the pres- 

 ence in the film of the supposed strata of silver spangles, as I may call 

 what looks like a brown stain more than an^^thing else, b}- transmitted 

 light. He has actually made a microscopic section of the color cradle, 

 and by means of the most refined conditions has been able to take' 

 once more by aid of photography a visible picture of the su])tle work 

 of light in the interior of a Lippmann film. Here is a copy of it on 

 the screen which he has sent me himself, with his explanation of its 

 import and its manufacture. All room for doubt (if science could 

 cease from doubting its own creeds) would seem removed b}^ this 

 simple fibrous-looking strip of lines. It is a rare pleasure to be able 

 to exhibit such brilliant colors, and such surprising demonstrations of 

 their cause, here in Oxford, and to acknowledge at the same time that 

 the whole series of investigation and invention which have furnished 

 these magnificent results is the fruit of French and German industr}' 

 and genius. 



