[2]

Philadelphia Photographer, December, 1879, p. 365.

[3]

I intended this publication to be a very full and explicit one, and it was sufficiently so to be perfectly understood by most who saw it; but some may think I did not sufficiently emphasize the importance of using the particular kind of chlorophyl which I mentioned. In a brief communication to the editor of the Photo. News, in 1883, I described some experiments with eosine as a color sensitizer, and then called attention to the superiority of blue-myrtle chlorophyl for this purpose, stating that I had not been able to secure such results with any other kind of chlorophyl, and that a fresh solution from fresh leaves must be used to secure the greatest possible degree of sensitiveness. See Photo. News, Nov. 1883, p. 747.

[4]

Photo. News, London, September 5, 1884, p. 566, and Year Book of Photography for 1885, p. 111.