R. DIAMOND, particularly for the valuable information
communicated through "N. & Q.," and his obligingness in answering
inquiries. I make no doubt he will readily reply to the following
questions, suggested by his late letter on the process for printing on
albumenized paper.

Will the solution of forty grains of common salt and forty grains of mur.
amm., _without the albumen_, be found to answer for ordinary positive paper
(say Canson's, Turner's, or Whatman's)? and, in that case, may it be
applied with a brush?

Will the forty-grain solution of nit. sil. (without amm.) answer for paper
so prepared? and may this also be applied with a brush?

Should the positives be printed out very strongly? and how long should they
remain in the _saturated_ bath of hypo.?

Is not the use of sel d'or subject to the objection that the pictures with
which it is used are liable to fade in time?

DR. DIAMOND says that pictures produced by the use of amm. nit. of silver
are not to be depended on for permanency. If this be so, it is very
important it should be known, as the use of amm. nit. is at present
generally recommended and adopted.

C. E. F.

_Mr. Lyte's New Process._--Although I presume it is none of your affair
what is said or done in "another place," will you kindly ask MR. LYTE for
me, if he will be so good as to explain the discrepancy which appears
between his "new processes," as given in the Journal of the Photographic
Society of Sept. 21, and "N. & Q." of Sept. 10? In the former he says, for
sensitizing, take (amongst other things) iodide of ammonia 60 grains: in
"N. & Q.," on the contrary, what would seem to be the same receipt, or
intended as the same, gives the quantity of this salt one fourth less, 45
grains--a vast difference. Again, in the developing solution the quantity
of formic acid is _double_ in your paper what it is in the journal.

I should not have trespassed on your space, but would have written to MR.
LYTE directly, except from the fear that some other unfortunate
practitioner may have stumbled over the same impediment as I have done, and
may not have had courage to make the inquiry.

S. B.

[Having forwarded this communication to MR. LYTE, we have received from
that gentleman the following explanations of his process, &c.]

The process which was published in the _Photographic Journal_ was, I am
sorry to say, not quite correct in its proportions, on account of a mistake
in inclosing the wr