New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1873-06-21


Reducing THE INTENSITY or A NEGATIVE.-Ac-
cording to Lotalle negative can be diminished in
intensity by first washing it and then covering it
with solution containing IS grains Of chloride Of
gold and SO of quart of water The operation is to
be repeated until the plate has obtained proper
tone quantity of nitric acid is then to be poured
ON one corner. enough to cover the whole plate.
when the silver is immediately dissolved and almost
disappears II is then To be reinforced with suphate
of iron, and then reappears with great degree OF
transparency. PyTOgallic acid may be made use OF
TO bring il p both to the desired degree Of intensity
and 10 that of transparency. The image which re-
mains after the application the nitric ac, on ac-
count OF its great Transparency IL wei adapted Tor
taking large pictures.
PREPARATION OF CoTToN FOR CoLLODIoN-M.
Adolph Martin Of Paris has lately suggested new
mode of preparing cotton for collodion, which IS
extremely soluble and well adapted for many pur-
poses of photography. For this purpose he takes
two parts of sulphuric acid Of &c., to which he ADDS
one part of dry nitrate Of potash. When the
mixture reaches the temperature of 1902 f., tho
cotton is introduced in small lunches taking care
TO allow il to become mostened as rapidly as posi-
BILE After seven or eight minutes tne whole Is
turned into large quantity OF water ana repeatedly
washed. These washinRs are continued untu the
cotton becomes completely neutral, and 10 IL then
carded with copper cards to remove all It's pulVeu
grammes Of cotton TO 800 grammcs OF the mixture
above mentioned.
TREATMENT OF Wool BY GLYcERINE.-Accordng
to Asseln, glycerne has hitherto failed to answer
it's expected part in the treatment OF the fiber OF
wool for dyeing IN consequence of want OF knowi-
edge of it's actual properties solvent and ne mas
been engaged in determining the degree OF soublty
in gycerine first Of the metallic soaps and those OF
magnesia and Of lime; second, Of the subsoaps' OF
soaps with an excess Of base third of the suphate
Of lime of cacareOus waters. As the result OF his
labors he to the conclusion that rational ara
moderate Of glyCeTine III the treatment OF wool
will aid i'm the manufacture of certain tissues OF uni
form tints and of bright cOlOrs, which has been con-
sidered impossible by some Fabrics worked from
wool SO treated always possess great superiority IN
their soft and pleasant feel quite different from that
where glycernc has not been employed. The calca-
reous waters winch are SO constantly met WIN III
manufacturing regions will be no longer an oiJec-
ton when gyccinc Is employed. SHOULD the gJc e-
rine occur IN any excess the wool IT can be easily
TcmOy cd by washing IN distilled water
ALLEGED New POTATO DIsEAsE.-A new potato
disease is described as having made its appearance
near Jena, differing from the one commonly known
in its directly attacking the tubers, and not the
leaves The tuber becomes covered by purplsh
felt, which is the mycelium Of fungus. The skin
Of the potato is sometimes apparently not pene-
trated by the myceum, tie contrary being the fact
in other cases. In the latter event, the tnber be-
comes completely destroyed by a cancerous dis
ease. The fungus belongs to tho genus Hctcr0ticam,
and, according to Prof. Hol!iss. the remedy Will
probably be the same ia the ordinary potato dis
ease-namely the selecting OF early KINDS, using
only mineral and no animal nor vegetable lnalurc3,
aud with a careful selection of the best adapted sou
The Rev NJ. j. Berkey, the eminent iungOlO9iSt'
however has lately announced that TINS ~ the Weu-
known Copper Web" which some years Is very
fixsat Ia
has been known, 10 some extent, 10 attack the
potato. It is figured in Tulasne's Fungi hypo-
gel, under the name of RhlzOctona.
Poisonous WooLEN GooDs.-Dr. Hagar states
that a number Of cases have occurred IN Berlin,
where coored wooden garments, worn next the ska,
have produced peculiar kind of poisoning. Violet
gray wooden stockings, after having been worn less
than six hours caused reducss Of the skin, and per
manent pustules in connection with teVerlsh symp-
TOMS and constipation. The same results followed
after the stockings had been treated with boiling
water Similar symptoms were produced by gray
WOODEN shirts, next the SKIN, and by the red binding
of others. FL considers the aniline colors as rule
poisluols in their tIOn upon the skn as has been
established in regard TO c0rallIue, Ia spite OF al
deuias the exceptional character OF a lev IN TINS
respect being difficult to establish. lie recon-
mends therefore that wooden garments coiorcd with
auilue col1rs should not be worn next the SKIN, ana
suggests as a test tor these cOCrs that portion OF
the wool be heated to boiling IN test-tuDe WIN ~
per cent alcohol. and II the latter acquire 4 red'
violet or yiOetbue tint the cOlOrng matter Is sus-
plclCuj.
CryNTT PROCESS OF PHOTOGRAPHY.-A SIMPLE
proce OF photography according to Mr.. Geynetcon-
sists. essentially in printing from layer of pre-
pared gelltinc which gives capital half tints For
this purpose 100 centiUammes of water aud five
grammes Of geatine, two grammes of isinglass, and
two of Flanders glue are dissolved together and
two to five grammes of bichromatc of potash lac
cording to the intensity of the negative desired are
to be added This is to be filtered through flannel
cloth. and then spread upon plates of copper highly
polished aud carefully oiled. The plates are next to
be dried in a stove, heated to lOl- Fahrenheit, ana
then exposed. under a negative, for one hour 10
Iii fused light or five minutes To the sun. When the
finest details are obtained the plate Is TO be removed
aud the geatne layer allowed To soak pure water
for an hour and then dried, when IL Is ready Tor an
IMPRESSION Ii is aftcrward 90 be treated like lto-
graphic stone 10y passing wet sponge over the sur,
face and APPLYING ink by means OF very hdI1
roller The impression should DO taken upon glazed
PAPER which need not be dampened. single plate
will furnish two hundred impressions. rms process
is quite similar in character 10 several that nave
beru more or less in use but IL is 50 extremely SIM
pic as TO be worthy of more extensive INTRODUCTION
GLUE FOR PARCHMENT PAPER IN MAKING SAv-
SAGE SKINs.-The secret Of the composition OF the
glue employed for fastening the parchment paper Vi
the artificial skins for sausages, and when reslsls
boiling water and all forms of moisture seems TO DE
well kept but the one indicated by DR.. Stinde in
the Phoogdphisches Archr is claimed to be equal 10
il in all respects. if not indeed identical. Add to
one quart of good adhesive solution Of gelatlne OF
cline $40 TO 40 grains of finely powdered bicmomate
If potash. Warm the mixture slightly on water
hath when about to use it, and before applying IL
moisten the parchment paper The latter, when
glued with this preparation, in the formation OF
the small cylinders for sausages, must be rapluiy
dried on hurdle and then exposed to the Hght unu
H. unlln,r nlne hncnmns hroMnish. Iheso cYnndcrs