th until the zinc solution has
thoroughly penetrated the film (we have found five minutes amply
sufficient for this purpose, although a much longer time is of no
consequence); it should then be taken out, allowed to drain upright on
blotting-paper until all the surface moisture has been absorbed (about
half an hour), and then put by until required. The nitrate of zinc,
which is still retained on the plate, is sufficient to keep it moist
for any length of time, and we see no theoretical or practical reason
why its sensitiveness should not be retained as long: experiments on
this point are in progress; at present, however, we have only subjected
them to the trial of about a week, although at the end of that period
they were hardly deteriorated in any appreciable degree. It is not
necessary that the exposure in the camera should be immediately
followed by the development, as this latter process can be deferred to
any convenient opportunity, provided it be within the week. Previous to
development, the plate should be allowed to remain for a few seconds in
the original thirty-grain silver-bath, then removed and developed with
either pyrogallic acid or a protosalt of iron, and afterwards fixed,
&c. in the usual manner."

* * * * *

Replies to Minor Queries.

_Tippet_ (Vol. ix., p. 370.).--P. C. S. S. cannot help thinking that
_tippet_ is nothing more than a corruption, _per metathesia_, of
_epitogium_. Such, at least, seems to have been the opinion of old Minsheu,
who, in his _Guide to the Tongues_, 1627, describes it thus:

"A habit which universitie men and clergiemen weare over their gownes.
L. _Epitogium_, ab [Greek: epi] and _toga_."

P. C. S. S.

_Heraldic Anomaly_ (Vol. ix., p. 298.).--As your correspondent JOHN O' THE
FORD wishes to be furnished with examples of arms now extant, augmented
with a cross in chief, I beg to inform him that on the north side of St.
John's Gate, Clerkenwell, immediately above the arch, are three shields:
the centre one bearing a plain cross (the arms of the order); on the right,
as you face the gateway, the shield bears a chevron ingrailed between three
roundles, impaling a cross flory, over all on a chief a cross; that on the
left is merely a single shield, bearing a chevron ingrailed between three
roundles apparently (being somewhat damaged), in chief a plain cross. If
th