572 



POPULAR SCIENCE MONTHLY. 



pigment tissue for the red and yellow 

 positives, that is, the tissue used with 

 the green and violet-light negatives is 

 charged with the complementary in- 

 alterable red and yellow pigments. The 

 pigment tissue, of whatever color, is 

 sensitized, exposed and developed in 

 the usual way with some modifications 

 made to facilitate the manipulation 

 during the development, transference 

 and subsequent superposition of the 

 films. 



The yellow positive is made first and 

 transferred to gelatine-coated paper 

 which forms the final support of the 

 photograph, the red positive is next 

 made and before drying is superposed 

 on the yellow positive, finally the blue 

 positive is superposed on the other two. 

 The resulting photograph, if the 

 negatives have been of the right 

 density, the pigments of the proper 

 colors and the technique right, is one of 

 which it can be safely said that none 

 made by any other process can be 

 compared with it. The photographs 

 are superior to three-color prints, just 

 as a carbon photograph is superior to 

 a half-tone print, and are superior to 

 an ordinary photograph in the same 

 measure that a carbon print is. 

 Miley's color photographs possess all 

 the richness, depth and permanence of 

 carbon photographs with the addition 

 of color. Unlike the three-color half- 

 tone prints, there is no break in the 

 continuity of the color. The texture and 

 minute details of the subject are faith- 

 fully reproduced with a naturalness 

 that can only be compared with the 

 originals. 



So far the process has been used for 

 still life, landscapes and paintings, but 

 it is possible to take portraits by it, 

 as the time of exposure through the 



red screen is about fifteen seconds and, 

 with a suitable plate-holder and screen- 

 holder, all three plates could be ex- 

 posed easily in less than thirty seconds. 

 It is hardly necessary to say that the 

 method can be used for the produc- 

 tion of transparencies and lantern 

 slides. These, however, have not yet 

 been made. 



SCIENTIFIC ITEMS. 

 We regret to record the deaths of 

 Professor William Harkness, the emi- 

 nent astronomer, past president of the 

 American Association for the Advance- 

 ment of Science; of Dr. Norman 

 Macleod Ferrers, F.R.S.., the mathe- 

 matician, master of Gonville and Caius 

 College, Cambridge, and of Mr. James 

 Glaisher, F.R.S., known for his work 

 in meteorology and aeronautics. 



Mr. Joseph Larmoe, fellow of St. 

 John's College, Cambridge, has been 

 elected Lucasian professor of mathe- 

 matics in succession to the late Sir 

 George Gabriel Stokes. Professor E. 

 F. Nichols, of Dartmouth College, has 

 been elected to a chair of physics in 

 Columbia University. Mr. Stewart 

 Culin, recently curator of the Museum 

 of Science and Art of the University 

 of Pennsylvania, has become curator of 

 ethnology to the Museum of the Brook- 

 lyn Institute of Arts and Sciences. 

 The Lucy Wharton Drexel medal of 

 the University of Pennsylvania was 

 presented to Professor F. W. Putnam 

 at the Founder's Day celebration on 

 February 21. Dr. Albert B. Prescott, 

 professor of chemistry in the Univer- 

 sity of Michigan, has Deen given the 

 degree of LL.D. by Northwestern Uni- 

 versity. 



