HOMAS, 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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PHOTOGRAPHY.

A COMPLETE SET OF APPARATUS for 4l. 4s., containing an Expanding Camera,
with warranted Double Achromatic Adjusting Lenses, a Portable Stand,
Pressure Frame, Levelling Stand, and Baths, complete.

PORTRAIT LENSES of double Achromatic combination, from 1l. 12s. 6d.

LANDSCAPE LENSES, with Rack Adjustment, from 25s.

A GUIDE to the Practice of this interesting Art, 1s., by post free, 1s. 6d.

French Polished MAHOGANY STEREOSCOPES, from 10s. 6d. A large assortment of
STEREOSCOPIC PICTURES for the same in Daguerreotype, Calotype, or Albumen,
at equally low prices.

ACHROMATIC MICROSCOPES.

Beautifully finished ACHROMATIC MICROSCOPE, with all the latest improvement
and apparatus, complete from 3l. 15s., at

C. BAKER'S, Optical and Mathematical Instrument Warehouse, 244. High
Holborn (opposite Day & Martin's).

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PHOTOGRAPHIC INSTITUTION.--An EXHIBITION of PICTURES, by the most
celebrated French, Italian, and English Photographers, embracing Views of
the principal Countries and Cities of Europe, is now OPEN. Admission 6d. A
Portrait taken by MR. TALBOT'S Patent Process, One Guinea; Three extra
Copies for 10s.

PHOTOGRAPHIC INSTITUTION,
168. NEW BOND STREET.

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PHOTOGRAPHIC CAMERAS.--OTTEWILL'S REGISTERED DOUBLE-BODIED FOLDING CAMERA,
is superior to every other form of Camera, for the Photographic Tourist,
from its capability of Elongation or Contraction to any Focal Adjustment,
its Portability, and its adaptation for taking either Views or
Portraits.--The Trade supplied.

Every Description of Camera, or Slides, Tripod Stands, Printing Frames,
&c., may be obtained at his MANUFACTORY, Charlotte Terrace, Barnsbury Road,
Islington.

New Inventions, Models, &c., made to order or from Drawings.

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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 publishe