The Sun.
London, England, 1864-05-18 00:00:00

WHITECHAPEL.

The supply of meat on sale is moderate, and the trade
rules heavy, as follows :
Beef, from 2s 8d to 4s Od ; mutton, 3s 4d to 4s 6d;
lamb, 5s 4d to 6s 8d ; veal, 38 6d to 4s 6d ; and pork, 3s Ott
to 4s 4d per 81bs by the carcase.

BOROUGH HOP.
Our market is dull, and prices have a downward ten-
dency, The accounts from the plantations are very
favourable.

SHIPPING INTELLIGENCE—(This Day.)

BY MAGNETIC TELEGRAPH.
GRAVESEND, Wednesday Morning.
Arrived, May 17—Sylph, from Barbadoes—Thomas
Dryden, from Shanghae—Balaklava, from Algoa Bay—
Sophia, Dunkirk—Carlo, from Trieste—Majestic, from
Jamaica—Santis, from Terceira.

DEAL, Wednesday Morning.
Passed, May 17—Cleopatra and Dorothea, from Deme-
rara—Jenny Jones, bark, from the West—Eskdale, from
Alexandria—all for London—Duchess of Bedford, of Dart-
mouth, from the North, for the West—Ann Increax, bark,
from the West, for the North—Cambrian, for Jamaica--
Heroine, for New York—both from London.

the
PHOTOGRAPHY.—Last week M. Poitevin coma
mnnieated to the French PhotogiVbio Society a
carious process of his for obtaining photographs in relief
ionngp. o rlc
fe laa itnh, i
cakplraoycee
rs so
fwhich
ohme
actai
Fl lead
gheellaiotpinlase
receivesti etigray-
impression of light through a negative, and then put into
water, those parts only will swell up that have been pro-
tected from the solar rays, so that all the shades of the
print comes out in relief, while those answering to the
light
remain depressed. In this state the impression on
gelatine resembles those ingenious
views on am
orcel • p ,
called lithographic, in which, on a lamp being
placed behind, the shades are produced by various
degrees of thickness in the porcelain. M. Poitevin, h •
having
obtained his impression on gelatine as above described, uses
it as a mould which he covers with plastic
which consequently the sunken arts porcelain, on
p
are brought out in
relief. The plate thus prepared is then coated with a thin
coloured enamel, and then baked in the oven. The picture
thus comes out very distinct, the fusible enamel having
mostlyrun into all the depressions, which here constitute the
shades. The lights, however, not being pure, this is reme-
died by grinding off the enamel carefully on the spots re-
quired, until the porcelain i•s uncovered. This done, the plate
is once more enamelled with a colourless glass and again ex-
posed to the action of the fir M. Kaiser, a Dutchman,
proposes the following dry collodion process :—A glass
plate is covered with collodion containing no bromide, but
known to yield good impressions by the ordinary methods.
It is exposed to the action of the silver bath, then washed
with filtered rain water, and afterwards with a mixture
of half a gramme of camphor, 100 cubic centimetres
of absolute alcohol, and two of acetic ether, so that
none of the water of the previous washing may
adhere to the plate. For this purpose the liquid is
slowly delivered to the plate by one of the corners, and
allowed to run oft at the opposite one, driving the water
before it. The plate is now left to dry, protected from dust
and all impurity. In order to develope the print he uses
a solution of -- 1 gramme of pyrogenic acid, 2 do. of citric
acid, dissolved in 100 cubic centimetres of distilled water,
and a few drops of a solution of nitrate of silver at 6 per
cent. The plates thus prepared may be preserved a month
without losing their sensibility, and may be developed
several weeks after exposure to the light.