ibrarian, Literary and Scientific
Institution, Islington, London.

* * * * *

Notices to Correspondents.

_We must beg the indulgence of many Correspondents for omitting to reply to
them this holiday week._

H. B. C._'s paper_, Impossibilities of History, _in our next_.

T. L. N. _For the authorship of the Latin verse on Dr. Franklin, see our
5th Volume_, pp. 17. 140. 549. 571.; _and_ Vol. vi., p. 88.

J--G., THE EDITOR, _and another Correspondent. No._

M. W. _Try a weaker solution of pyrogallic; that is, make the ordinary
3-grain to the ounce solution, and use one-third of that and one-third of
plain water, and the results will probably be what you desire. The bath
will keep for a long time, if kept free from dust, &c._

_The extent which Photography occupies in our present Number will, we are
sure, excuse us, in the eyes of several Correspondents. for the omission of
their communications._

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_.

* * * * *

COLLODION PORTRAITS AND VIEWS obtained with the greatest ease and certainty
by using BLAND & LONG'S preparation of Soluble Cotton; certainty and
uniformity of action over a lengthened period, combined with the most
faithful rendering of the half-tones, constitute this a most valuable agent
in the hands of the photographer.

Albumenized paper, for printing from glass or paper negatives, giving a
minuteness of detail unattained by any other method, 5s. per Quire.

Waxed and Iodized Papers of tried quality.

Instruction in the Processes.

BLAND & LONG, Opticians and Photographical Instrument Makers, and Operative
Chemists, 153. Fleet Street, London.

*** Catalogues sent on application.

* * * * *

THE SIGHT preserved by the Use of SPECTACLES adapted to suit every variety
of Vision by means of SMEE'S OPTOMETER, which effectually prevents Injury
to the Eyes from the Selection of Improper Glasses, and is extensively
employed by

BLAND & LONG, Opticians, 153. Fleet Street, London.

* * * *