Hammersmith.
_Photographic Queries._--1. Would you, Sir, or DR. DIAMOND (DR. MANSELL is
too far off), be kind enough to inform your readers whether DR. MANSELL'S
process, recommended in No. 225., is equally applicable to _inland_ as to
sea-side operations; or must we, in the one case, follow DR. DIAMOND, and
in the other DR. MANSELL, and thus be compelled to prepare two sets of
papers?
2. DR. MANSELL recommends, as a test for the iodized paper, a _strong_
solution of bichloride of mercury; may we ask _how strong_?
3. MR. SISSON'S developing fluid has undergone so many changes, and has
been so much written about, that we are at a loss to discover or to
determine whether it has been at length settled, in the mind of the
inventor, that it will do equally well for negatives as for positives.