F. S. A. _The origin as well as the demolition of Castell Dinas, Bran, near Llangollen, have baffled our topographical antiquaries. For some notices of this fortress consult Pennant's_ Tour in Wales, p. 279., edit. 1778 (_with a plate of it_); _Leland's_ Itinerary, vol. v. p. 51.; _and_ Beauties of England and Wales, vol. xviii. p. 558. RUSTICA. _The Dutch Gothic Church_, noticed in The Times _of the 5th inst., is in Austin Friars_. J--G. _We did not succeed in getting the book._ NEISON ON RAILWAY ACCIDENTS _is published in the_ Journal of the Statistical Society _for December, 1853, and may be had of Parker, 445 Strand_. B. T. A. _The line_ "England, with all thy faults I love thee still," _is by Cowper_ (The Task, book ii.). REV. J. J. _We fear some injustice was done--unintentionally, but fear also that it is now too late to remedy it._ INQUIRER (Birmingham). _Some of our correspondents have met with great success from Mr. Crookes' process; but we are bound to say that it has not been universal._ G. W. E. _recommends that in immersing a collodion plate it should first be inserted horizontally, and then transversely in the nitrate of silver bath, as a sure means of avoiding spots_. _He is informed that if the edges of his glass are roughed, it will greatly tend to the adhesion of the collodion. The nitrate of silver bath, used for exciting collodion plates, is not available for exciting albumenized paper or any other purpose._ H. C. C. _1. The addition of cyanide of potassium to the sensitive collodion not only prevents its decomposition, but appears to add to its general good qualities. 2. Protosulphate of iron mixed with your nitrate bath is quite fatal. 3. Good pictures are constantly taken when the temperature is below sixty; though there is no doubt all chemical action is quicker in warm weather._ B. (Manchester). _See_ "N. & Q.," No. 205, _October 1, 1853_. W. BEATSON. _There are difficulties in the way of such an exchange of photographic pictures, which are very difficult to overcome. At present we believe the Photographic Society, with the aid of an energetic Council, have been unable to effect this, even to a limited extent._ ERRATUM.--Vol. ix., p. 220. col. 1. line 9, _for_ 1533-5 _read_ 1633-5. OUR EIGHTH VOLUME _is now bound and ready for delivery, price_ 10s. 6d., _cloth, boards. A few sets of the whole Eight Volumes are being made up, price_ 4l. 4s.--_For these 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_. * * * * * Patronised by the Royal Family. TWO THOUSAND POUNDS for any person producing Articles superior to the following: THE HAIR RESTORED AND GREYNESS PREVENTED.