New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1850-11-27

light coming from those parts oil the moon called
seas and that of the borders and more brilliant
parts as also between the light called ashy, and
that of the visible disc Of the moon and spoke OF
some peculiarties presented from the observation
Of the light of the satellites OF Jupiter, compared
with that of the planet and of the difficulties
which exist in giving an explanation OF the phe-
nonena.
| MANUFACTURE OF SUGAR IN THE FRENCH
COLONIES.
The French Minister OF Agriculture and Com
merce in the early part of the present year dis
patched NJ. QUIET to the French Colonies, to OBJ
! serve and experiment upon the celebrated pro-
| cesses proposed by NJ Melsens for the manufacture
! of Sugar The first Report Of NJ. Quiet is dated
| at Guadaloupo, 26th april, and from compre
| hensiye synopsis IN the London PdteM Journal
we take the following interesting extracts;
Up to the period indicated, NJ Quiet had made
| but few experiments, and those not under favor
! able circumstances; the results, however, were
such as to lead to the expectation that the bisu
! phate oflime will be adyantageously employed IN
| the Colonies in the manufacture of sugar. Accord
ing to the first observations, the Cane-julCe pre-
served from fermentation by means Of the bisu
| plate OF lime, can be made to undergo, without
! inconvenience, decantation and filtration before
| being cleansed or defeated. The bisu phate of
lime will also arrest the fermentation of the canes
| which are ottentimes left after having been cut
| exposed to the heat Of the sun, when any inter
ruption takes place in the pressing process. NJ
| Quiet appears to think that the ingenious process
of III Boucherie for the preservation OF wood may
| be applied to the injection OF any part OF the
sugar cane with the bisulphate of lime, thus pre-
! serving it from fermentation. He has commenced
series of experiments on this interesting subject.
TILE GEOLOGICAL FORMATION OF ORES OF
ZINC.
BY NJ. }. DeIANoNr
The following is q resume Of M. Delanoue 5 OBJ
servatons and experiments
l. All the Zine Ores are deposits of thermal
sources.
. The different proportions of water entering
INTO the composition of the Of these beds,
represent the different degrees OF heat Of their
sources.
B. The Sulphurets of Lead, Zinc, &c are gen
orally the first formed They most probably
suit from the reaction of organic matters in the Sui
plates
4. The Carbonates OF Lead Zinc, &c. are gen
orally deposited above the Suphurets and formed
by the reaction of the metallierous III some
Carbonate
5 Hence, a real Zinc Ore bed cannot be found
without Carbonate, and calcareous rock always
serves the guide in all researches for these ores
g. AS the Carbonates do not readily precipitate
the Salts of Iron and Manganese except in contact
with the air the Hydrated Ores OF Iron ana Man
gancse form superficial deposits above the Ores OF
| Zinc.
Lastly. and as the practical consequence which
results from the preceding, the beds OF Hydrated
Oxide OF Iron containing Calamlne, IN Belgium
and the North of France, indicate the presence OF
fhe mere valuable Ores of Zinc and of Lead the
existence ofwhich can thus be readily asccrtamed
THE COLORs EMPLOYED BY THE ANCIENTS.
ANALYSIS and Directions for The Manufacture OF Mineral
Blue Color found IN n GHlo-Roman Villa, in the forest
Of Breone (Seine lHdneureb IN Normandy BY nj
GlRARDlN, Corresponding Member OF the Academy OF
Sciences, and Professor OF Chemistry al the CoIiege
Several kilogrammes of this blue color were
found in an earthen jar, in the state OF trabe con
| cretions but which, on close examination, had
| evidently been fine powder. 1t had no taste,
I was insouble in water, but efervesced violently
| on contact with acids, 100 parts CT this blue gave
out 1880 of carbonate of lime withtrace of oxide
of IRON when treated with hydrochloric acld.-
| After this treatment, the lnsolube powder remain
| ing had all the appearance OF artificial ultra ma
rine it resisted the most powerful heat, and was
neither fused nor altered in color. The most pow
| erlul acids had no action whatever on 1t 1t was
! scarcely acted upon by nitromuriatic acid; but
! when heated to redness with several times Its
weight of caustC potash, It fused and on cooling,
presented mass OF sombre green color, for the
most part soluble in hydro chloric acid. could
| find no trace whatever Of cobalt. A quantitatiye
analysis gave me the following results;
Silica. l9i
lime 1lt with aces OF Magnesia and ron.,.. l9i
Soda. 1919 90
Oxide OF Copper '''''..'''.''. '''''' 70
Total. ACKNOWLEDGEMENTS,
This blue substance IS, therefore, glass, color
ed by oxide OF copper, in all respects analogous TO
the cGYRienln OF Nitruvius, or the Alexandrlan
glaze ff1He,) or puzzola. which the Roman artists
employed for fresco painting and the decoration
| OF their apartments.
Chaptal, in 1909, made qualitative analysis Of
q color OF the same kind which was found IN the
shop OF color-deaer in Pompeii, and presented
to HIM by the Empress Maria Louisa; and Desco-
NV
color IN the hlerogyphical paintings in an ancient
Egyptian monument,
Sir H. Dayy speaks of the same mineral color
in his interesting work on the colors of the an
clients, published in 1915. He states that the blue
parts of the monument Of Caius Cestuis. of the
nuptias OF Aldobrandiue, and of the baths of Ii.
tus, at Rome are done with this color. In an ex-
cayatiou made at PompeI in 1914, in the presence
OF Sir II. Davv, be found pot of pale blue color.
which he analysed, and found to be mixture of
| lime and Alexandrian glaze. Davy did not give
any quantitative ANALYSIS Of this blue color, but
quoted the following passage from Ntruyius
The preparation OF this blue color was originally
! invented at Alexandra, and Nestorius has since
established q mandatory OF it at PuzZola. 1t is
| an admirable discovery sand and flowers OF nG-
tron carbonate of soda, are first ground together,
as finest -four, then mixed with copper filings,
moistened with q small quantity of water and
! MADE INTO kind of paste. 1t is then heated in
an earthen pot placed in q furnace, so that the
mass becomes fused, and gives rise to blue
color. 1t was with this glaze that the Roman
attlsts OBTAINED all their shades of blue, by mix
ing the hnely powdered glaze with various pro.
portions OF chalk =
This same color was also found at Rome, in
u az IN the shop OF color-dealer, adjoining the
baths OF Titus, and at Vieux, in the Department Of
The beauty and solidity of this color, which re.
sists the action OF the most powerful agents and
is not affected by air light or moisture ought to
claim the attention ofour painters and decorators.
especially as is also cheaper than small. azure,
or cobalt 1t may be obtained by strongly cal
ching for two hours at forge heat, mixture OF
60 parts oil silicious sand Is parts C: soda. aud
to 10 parts Of oxide Of copper