s and worthless imitations of this valuable detergent.
The Genuine is made only by the Inventor, and is secured with a Red Label
bearing this Signature and Address, RICHARD W. THOMAS, CHEMIST, 10. PALL
MALL, Manufacturer of Pure Photographic Chemicals: and may be procured of
all respectable Chemists, in Pots at 1s., 2s., and 3s. 6d. each, through
MESSRS. EDWARDS, 67. St. Paul's Churchyard; and MESSRS. BARCLAY & CO., 95.
Farringdon Street, Wholesale Agents.

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PHOTOGRAPHIC SOCIETY.--The Council will open in the beginning of January,
at the rooms of the Society of British Artists, in Suffolk Street, Pall
Mall, an exhibition of Photographs and Daguerreotypes. Coloured Pictures
will not be excluded. It is recommended that all pictures sent should be
protected by glass. No picture will be exhibited unless accompanied by the
name and address of the Photographer or Exhibitor, and some description of
the process employed. Pictures will be received at the Rooms in Suffolk
Street, from Monday the 19th to Monday the 26th December. Further
information may be obtained by application to the Secretary, R. FENTON,
ESQ., 2. Albert Terrace, Albert Road, Regent's Park.

* * * * *

PHOTOGRAPHIC APPARATUS, MATERIALS, and PURE CHEMICAL PREPARATIONS.

KNIGHT & SONS' Illustrated Catalogue, containing Description and Price of
the best forms of Cameras and other Apparatus. Voightlander and Son's
Lenses for Portraits and Views, together with the various Materials, and
pure Chemical Preparations required in practising the Photographic Art.
Forwarded free on receipt of Six Postage Stamps.

Instructions given in every branch of the Art.

An extensive Collection of Stereoscopic and other Photographic Specimens.

GEORGE KNIGHT & SONS, Foster Lane, London.

* * * * *

IMPROVEMENT IN COLLODION.-J. B. HOCKIN & CO., Chemists, 289. Strand have,
by an improved mode of Iodizing, succeeded in producing a Collodion equal,
they may say superior, in sensitiveness and density of Negative, to any
other hitherto published: without diminishing the keeping properties and
appreciation of half tint for which their manufacture has been esteemed.

Apparatus, pure Chemicals, and all the requirements for the practice of
Photography. Instruction in the Art.

* * * * *

PHOTOGRAPHIC INSTITUTION.--An EXHIBITION of PICTURES,