sitives, at two shillings a quire, and, indeed, it might do for
negatives.

Secondly, I prefer making the iodide of silver in the way which I have
described.

Thirdly, Soft water is better for washing the iodized paper; if,
however, spring water be made use of, _warm_ water should be added, to
raise it to a temperature of sixty degrees. I think that sulphate or
bicarbonate of lime would be injurious, but I cannot speak with any
certainty in this respect, or to muriate of soda.

Fourthly, The iodized paper should keep good for a year, or longer; but
it is always safer not to make more than is likely to be used during the
season.

Fifthly, If I am going out for a day, I generally excite the paper
either the last thing the night before, or early the following morning,
and develope them the same night; but with care the paper will keep for
two or three days (if the weather is not hot) before exposure, but of
course it is always better to use it during the same day.

WM. J. NEWTON.

6. Argyle Street.

_Talc for Collodion Pictures._--Should any of your photographic friends
wish to transmit collodion pictures through the post, I would suggest
that thin plates of talc be used instead of glass for supporting the
film; I find this substance well suited to the purpose. One of the many
advantages of its use (though I fear not to be appreciated by your
archaeological and antiquarian section) is, that portraits, &c., taken
upon talc can be cut to any shape with the greatest ease, shall I say
suitable for a locket or brooch?

W. P.

Headingley, Leeds.

* * * * *

REPLIES TO MINOR QUERIES.

_Portrait of the Duke of Gloucester_ (Vol. vii., p. 258.).--I beg to
inform MR. WAY that he will find an engraving of "The most hopefull and
highborn Prince, Henry Duke of Gloucester, who was borne at Oatlandes
the eight of July, anno 1640: sould by Thos. Jenner at the South entry
of the Exchange," in a very rare pamphlet, entitled:

"The Trve Effigies of our most Illustrious Soveraigne Lord,
King Charles, Queene Mary, with the rest of the Royall
Progenie: also a Compendium or Abstract of their most famous
Genealogies and Pedegrees expressed in Prose and Verse: with
the Times and Places of their Births. Printed at London for
John Sweeting, at the Signe of the Angell, in Pope's Head
Alley, 1641, 4to."

For Henry Duke of Gloucester, see p. 16.:

"What dot