e, London.

* * * * *

PHOTOGRAPHY.--Collodion (Iodized with the Ammonio-Iodide of Silver)--J.
B. HOCKIN & CO., Chemists, 289. Strand, were the first in England who
published the application of this agent (see _Athenaeum_, Aug. 14th).
Their Collodion (price 9d. per oz.) retains its extraordinary
sensitiveness, tenacity, and colour unimpaired for months: it may be
exported to any climate, and the Iodizing Compound mixed as required. J.
B. HOCKIN & CO. manufacture PURE CHEMICALS and all APPARATUS with the
latest Improvements adapted for all the Photographic and Daguerreotype
processes. Cameras for Developing in the open Country. GLASS BATHS
adapted to any Camera. Lenses from the best Makers. Waxed and Iodized
Papers, &c.

* * * * *

PHOTOGRAPHY--The AMMONIO-IODIDE OF SILVER in Collodion, prepared by
MESSRS. DELATOUCHE & CO., Operative Chemists, 147. Oxford Street, is now
generally used by Photographers, and cannot be surpassed in the
beautiful results it produces. Specimens may be seen on application.
MESSRS. DELATOUCHE & CO. supply Apparatus with the most recent
Improvements, Pure Chemicals, English and Foreign Papers, and every
Article connected with Photography on Paper or Glass. Instruction given
in the Art.

See HENNAH'S new work on the Collodion Process, giving the most
practical directions yet published, price 1s., or free by post 1s.
6d.

* * * * *

TO ALL WHO HAVE FARMS OR GARDENS.

THE GARDENERS' CHRONICLE AND AGRICULTURAL GAZETTE.

(The Horticultural Part edited by PROF. LINDLEY)

Of Saturday, March 26, contains Articles on

Agricultural statistics
Beet, sugar, by Mr. Sinclair
---- large and small, by Prof. Sullivan
Bignonia Tweediana
Boiler incrustations
Boronia serrulata
Calceolaria pavonia
Calendar, horticultural
---- agricultural
Cloches, by Mr. Gilbert
Cyclamens, to increase
Drainage, suburban, by Mr. Marshall
---- deep and shallow, by Mr. Hunt
---- Nene Valley
Farm practice
Fruit, changing names of
Heating public buildings
Ireland, Locke on, rev.
Irrigation, Mr. Mechi's
Larch, treatment of
Level, bottle, by Mr. Lucas (with engraving)
Major's Landscape Gardening
Manure, Stothert's
Mint, bottled
Nitrate of soda, by Dr. Pusey
Oaks, Mexican
Onion maggot
Pampas grass, by Mr. Gor