1876. "Practical Treatise on Enamelling and Retouching," by P. Piquepe, Piper and Carter, London.

1877. Ferrous oxalate developer published June 29th.

-- Wratten precipitated the gelatine emulsion with alcohol, and so avoided the necessity of dialysing.

1878. Improvement in platinotype patented by W. Willis, junior, July.

-- Abney's "Treatise on Photography" published.

-- Abney's "Emulsion Process" published.

1879. J. Werge's non-actinic developing tray introduced at the South London Photographic Society.

1880. "Principles and Practice of Photography," by Jabez Hughes, comprising instructions to make and manipulate gelatino dry plates, by J. Werge. London: Simpkin and Marshall, and J. Werge.

-- Gelatino-bromide of silver paper introduced by Messrs. Morgan and Kidd.

-- Platinotype improvement patent granted.

-- Iodides added to gelatino-bromide of silver emulsions by Captain W.

de W. Abney.

1880. Warnerke's sensitometer introduced.

-- "The Argentic Gelatino-Bromide Workers' Guide," by John Burgess. W.

T. Morgan and Co., Greenwich.

-- "Photography; its Origin, Progress, and Practice," by J. Werge.

London: Simpkin, Marshall, and Co.

-- Hydroquinone developer introduced by Dr. Eder and Captain Toth.

1881. Stannotype process introduced by Walter Woodbury.

-- Photographers in Great Britain and Ireland 7,614 as per census returns.

-- "Modern Dry Plates; or Emulsion Photography," by Dr. J. M. Eder, translated from the German by H. Wilmer, edited by H. B. Pritchard.

London: Piper and Carter.

-- "Pictorial Effect in Photography," by H. P. Robinson (cheap edition).

Piper and Carter.

-- "The Art and Practice of Silver Printing," by H. P. Robinson and Captain Abney. Piper and Carter.

1882. Herbert B. Berkeley recommended the use of sulphite of soda with pyrogallic acid to prevent discolouration of film.

-- "Recent Advances in Photography" (Cantor Lectures, Society of Arts), Captain Abney. London: Piper and Carter.

1882. "The A B C of Modern Photography," comprising practical instructions for working gelatine dry plates, by W. K. Burton. London: Piper and Carter.

1882. "Elementary Treatise on Photographic Chemistry," by A. Spiller.

London: Piper and Carter.

1883. Translation of Captain Pizzigh.e.l.li and Baron A. Hubl's booklet on "Platinotype;" published in _The Photographic Journal_.

-- Orthochromatic dry plates; English patent granted to Tailfer and Clayton, January 8th.

-- "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. Pizzigh.e.l.li'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.