-- "The Chemical Effect of the Spectrum," by Dr. J. M. Eder. (Translated from the German by Captain Abney). London: Harrison and Sons. 1883. "The Chemistry of Light and Photography," by Dr. H. Vogel. London: Kegan Paul. 1884. "Recent Improvements in Photo-Mechanical Printing Methods," by Thomas Bolas, Society of Arts, London. -- "Picture-Making by Photography," by H. P. Robinson. London: Piper and Carter. 1885. "Photography and the Spectroscope," by Capt. Abney, Society of Arts. -- "The Spectroscope and its Relation to Photography," by C. Ray Woods. London: Piper and Carter. -- "Photo-Micrography," by A. C. Malley; second edition. London: H. K. Lewis. 1886. Orthochromatic results exhibited by Dixon and Sons at the photographic exhibition in October. -- English patent rights of Tailfer and Clayton's orthochromatic process secured by B. J. Edwards and Co., Nov. 18th. 1887. Platinotype improvements; two patents. 1888. Pizzighelli's visible platinotype printing paper put on the market in June. 1889. Eikonogen developer patented by Dr. Andresen, of Berlin, Germany, March 26th. -- Wire frames and supports in camera extensions patented by Thomas Rudolph Dallmeyer and Francis Beauchamp, November 6th. CONTRIBUTIONS TO PHOTOGRAPHIC LITERATURE. BY JOHN WERGE. _Originally published in the "Photographic News," "British Journal of Photography," Photographic Year-Book, and Photographic Almanac._ PICTURES OF NIAGARA. Taken with Camera, Pen, and Pencil. Many very beautiful and interesting photographic views of Niagara Falls, and other places of romantic and marvellous interest, have been taken and exhibited to the world. Indeed, they are to be seen now in almost every print-seller's window; and in the albums, stereoscopes, or folios of almost every private collector. But I question very much if it ever occurred to the mind of anyone, while looking at those pictures, what an amount of labour, expense, and danger had to be endured and encountered to obtain them--"the many hairbreadth 'scapes by flood and field," of a very "positive" character, which had to be risked before some of the "negatives" could be "boxed." Doubtless Mr. England, Mr. Stephen Thompson, and Mr. Wilson have many very vivid recollections of the critical situations they have been in while photographing the picturesque scenery of the Alpine passes of Switzerland, and the Highlands and glens of Scotland. Mr. Stephen Thompson has narrated to me one or two of his "narrow escapes" while photographing his "Swiss scenes," and I am sure Mr. England did not procure his many and beautiful "points of view" of Niagara Falls without exposing himself to considerable risk.