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_.

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