Broctuna. Could the article proposed be divided into two papers?
Mr. Crookes. Where can we address a letter on a Photographic subject to this Correspondent?
Our Sixth Volume, strongly bound in cloth, with very copious Index, is now ready, price 10s. 6d. A few complete sets of "Notes and Queries," Vols. I. to VI., price Three Guineas for the Six Volumes, may now be had; for which early application is desirable.
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PHOTOGRAPHY.—XYLO-IODIDE OF SILVER, prepared solely by R. W. THOMAS, has now obtained an European fame; it supersedes the use of all other preparations of Collodion. Witness the subjoined Testimonial.
"122. Regent Street
"Dear Sir,—In answer to your inquiry of this morning, I have no hesitation in saying that your preparation of Collodion is incomparably better and more sensitive than all the advertised Collodio-Iodides, which, for my professional purposes, are quite useless when compared to yours.
"I remain, dear Sir,
"Yours faithfully,
"N. Henneman.
Aug. 30. 1852.
to Mr. R.W. Thomas."
MR. R. W. THOMAS begs most earnestly to caution photographers against purchasing impure chemicals, which are now too frequently sold at very low prices. It is to this cause nearly always that their labours are unattended with success.
Chemicals of absolute purity, especially prepared for this art, may be obtained from R. W. THOMAS, Chemist and Professor of Photography, 10. Pall Mall.