Juvenis. We must repeat that we cannot undertake the invidious task of recommending our Correspondents where to purchase their photographic apparatus and materials. Our advertising columns give ample information. The demand for cheap apparatus, if it becomes general, will be sure to be supplied.
Errata.—P. 569. col. 1. l. 45., for "ooyddes" read "Ovyddes." P. 548 col. 2. l. 47, for "1550" read "1850."
The Index to our Seventh Volume is in forward preparation. It will be ready, we hope, by Saturday the 16th, when we shall also publish our Seventh Volume, Price 10s. 6d., cloth, boards.
A few complete sets of "Notes and Queries," Vols. i. to vi., price Three Guineas, may now be had; for which early application is desirable.
"Notes and Queries" is published at noon on Friday, so that the Country Booksellers may receive Copies in that night's parcels, and deliver them to their Subscribers on the Saturday.
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.
Now ready, Two New Volumes (price 28s. cloth) of