cription of Cameras, Slides, and Tripods may be had. The
Trade supplied.

* * * * *

PHOTOGRAPHIC APPARATUS.--MR. JOHN J. GRIFFIN has now ready an entirely NEW
CATALOGUE OF PHOTOGRAPHIC APPARATUS AND CHEMICALS at Reduced Prices;
embracing an account of every article required for the processes on Silver,
Paper, and Glass, with estimates of the cost of complete sets for Home Use
and for Travellers. Postage Fourpence.

JOHN J. GRIFFIN, F.C.S., Chemist and Optician, 10. Finsbury Square, London.

* * * * *

PHOTOGRAPHY.--HORNE & CO'S Iodized Collodion, for obtaining Instantaneous
Views, and Portraits in from three to thirty seconds according to light.

Portraits obtained by the above, for delicacy of detail rival the choicest
Daguerreotypes, specimens of which may be seen at their Establishment.

Also every description of Apparatus, Chemicals, &c. &c., used in this
beautiful Art.--123. & 121. Newgate Street.

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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.

THE COLLODION AND POSITIVE PAPER PROCESS. By. J. B. HOCKIN. Price 1s., per
Post, 1s. 2d.

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TO PHOTOGRAPHERS, DAGUERREOTYPISTS, &c.-- Instantaneous Collodion (or
Collodio-Iodide Silver). Solution for Iodizing Collodion. Pyrogallic,
Gallic, and Glacial Acetic Acids, and every Pure Chemical required in the
Practice of Photography, prepared by WILLIAM BOLTON, Operative and
Photographic Chemist, 146. Holborn Bars. Wholesale Dealer in every kind of
Photographic Papers, Lenses, Cameras, and Apparatus, and Importer of French
and German Lenses, &c. Catalogues by Post on receipt of Two Postage Stamps.
Sets of Apparatus from Three Guineas.

* * * * *

COLLODION PORTRAITS AND VIEWS obtained with the greatest ease and certainty
by using BLAND & LONG'S preparation of Soluble Cotton; certainty and
uniformity of action over a lengthened period, combined with the most