Sacramento daily record-union. [volume] (Sacramento [Calif.]) 1875-1891, 1881-10-08
SCIENTIFIC NOTES.

A scientific and industrial exhibition
will be opened next November at Orizaba
under the patronage of Vera Cruz
From paper published in lie Gene CirH
on experiments performed with the Gre
mating furnaces of Cadet, Muller & Fichet
and de Lagenardiere, it appears that the
disposing of human remains by burning Is
making considerable progress in Italy.
An investigation regarding the asphyx-
iating action of cess pool drainage has been
made by Boutmy and Descoust. A cubic
meter Of cess-pool liquid, even after Off
cial disinfection, rendered eight cubic me-
tiers of air fatal TO animals that were com.
PEELED to breathe it.
Three methods are practiced in France
to protect the vines from phylloxera, &C.
cording to Mr.. Percival First submer
sion of the vineyard, when practicable !;
second, employment of insecticides, and
third, where the vineyards have been de-
stroyed), the planting of the more hardy
American vines.
In the Pakhoi district of the Province
of Kwangtung, China, wild silk-worms are
found that live on the camphor tree. Just
before the caterpillar is about to enter the
pupa stage of its existence the natives cut
il open and extract the silk in a form re-
senbling cat gut. When this substance is
dried it is used for fish lines, and it is said
to answer that purpose admirably.
This is M. Boyveau's method of testing
the ethereal oil of bitter almonds: The
spurious oil has a specific gravity of l.029
to O3O, while that of the genuine oil is
.O43, or, according to other statements,
l.O45 to LOGO. When the genuine oil,
however, is mixed with an equal volume
of sulphuric acid it turns red, but remains
hmpid and clear; on the other hand, the
spurious oil turns dark red it then be-
comes brown, dull and thick, and, lastly,
it congeals to brownish mass.
On August Let, another note on the form
alton of tails of comets was read by Nj.
Fave before the French Academy. He
held that Herschel, Arago, Delaunay, and
other astronomers, did not thoroughly
study the subject, but that Newton did so,
and gave an adequate explanation. The
author maintained that the tails of comets
are nothing but the result of continual
emission of particles from the heads of
these visitants, very like the tail of smoke
emitted by running locomotive.
David Undo, of Falmouth, Jamaica,
says that he was recently led to try the
effect of solution of sulphate of sodium
instead of dilute sulphuric acid in Grove
battery The results obtained were ex.
cellent. He employed solution contain
ing one part sulphate of sodium in crystals
dissolved in five parts of water. No ANAL
gamation of the zinc was required, and the
intensity of current appeared TO be quite
as great as when dilute sui phuric acid was
used. Two OF Groves quarts charged in
this way were employed on several occa-
sions for the purpose of precipitating cop
per when estimating. A solution of sui
phate of sodium answers equally well in
Bunsen's cells.
How photography of colors may be ac-
complished by dyeing layers of coagulated
albumen was lately explained to the
French Academy of Science, by c. eros
and J. Carpenter. They submitted two
Photographic proofs of painting in water
colors along with the original, showing the
exact reproduction of the details and col
ors. Three photographs of the original
were taken, one through liquid orange
screen, another through liquid green
screen, and third through liquid violet
screen. For the image obtained through
the first screen red color bath was en-
ployed for that produced through the
second screen, blue bath ; and for that
effected through the third screen, yellow
bath. In this process there is evidently
no direct Photographic reproduction of OBJ
jects with their natural colors.