es', La Croix, and other
Talbotype Papers.

Pure Photographic Chemicals.

Instructions and Specimens in every Branch of the Art.

GEORGE KNIGHT & SONS, Foster Lane, London.

* * * * *

PHOTOGRAPHIC APPARATUS MANUFACTORY, Charlotte Terrace, Barnsbury Road,
Islington.

T. OTTEWILL (from Horne & Co.'s) begs most respectfully to call the
attention of Gentlemen, Tourists, and Photographers, to the superiority of
his newly registered DOUBLE-BODIED FOLDING CAMERAS, possessing the
efficiency and ready adjustment of the Sliding Camera, with the portability
and convenience of the Folding Ditto.

Every description of Apparatus to order.

* * * * *

SPECTACLES.--WM. ACKLAND applies his medical knowledge as a Licentiate of
the Apothecaries' Company, London, his theory as a Mathematician, and his
practice as a Working Optician, aided by Smee's Optometer, in the selection
of Spectacles suitable to every derangement of vision, so as to preserve
the sight to extreme old age.

ACHROMATIC TELESCOPES, with the New Vetzlar Eye-pieces, as exhibited at the
Academy of Sciences in Paris. The Lenses of these Eye-pieces are so
constructed that the rays of Light fall nearly perpendicular to the surface
of the various lenses, by which the aberration is completely removed, and a
telescope so fitted gives one-third more magnifying power and light than
could be obtained by the old Eye-pieces. Prices of the various sizes on
application to

WM. ACKLAND, Optician, 93. Hatton Garden, London.

* * * * *

{67}

HAMILTON'S MODERN INSTRUCTIONS for the PIANOFORTE. Thirty-eighth Edition
Price 4s.

"So simple and clear are the directions laid down that any one with a
moderate degree of application would have no difficulty in overcoming
the intricacies of the instrument. The lessons are progressive, and the
treatise is popular," &c.--Tallis's _London Weekly Paper_.

ROBERT COCKS & CO.'s CHORISTER'S HAND-BOOK. Edited by JOSEPH WARREN. 1 vol.
4to., white cloth boards, price 8s. or in 52 Numbers, each 2d.

"Valuable contribution to choral melody; contains no fewer than
fifty-two anthems, arranged for two, three, or four voices (with piano
or organ accompaniment), in a very effective style. The work is
marvellously cheap, and should find a place in every parochial
choir."--Tallis's _London Weekly Paper_, March 12