New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1868-07-08
SCIENCE.

NATURAL ANMNE.-The mOllusk, commonly
called the seahare found in large numbers the coast
OF Portugal exudes . means OF defense, an offensive
cooring matter, which has been analysed by NJ Zegef
Mulhouse who has ascerained that it is composed
principally Of anline. All the species OF mousca in
cuded under the general name Of mureX yield dye
which supposed 10 be the same rs that used by the
Phgnicians for producing the famous Iyran purple D'
held in high repue among the ancents was probably OBJ
tanned from the ApySo or seahare IL must however,
DO said the credit of Chemistry that by her processes
the ordinary coatar made TO yield anlne al cheaper
rate than il can now be obtained from the
which 10 is supposed the ancents had recourse or
their supply
SOULS VERSUS OARs.-Dunng o late discus
the slip OF propeers, at the Institution OF
Naval Architects London, the chairman Vice Admiral
Belcher incidentally said he wanted 10 know how
36tun gg with lSteet beat them outandout with
two souls There men at each scul, the SOULS
SOULS drove the Japanese vessel ahead faster than his
gig could follow The distance the SOULS passed through
the water could not have been above or inches andn
was only the bend OF the oar which gave diagonal JERK
the vessel
rhe question was not there answered but 10 Is evident
the japanese scuers had advantage In almost con-
tnuous application Of their power In Venice. the gon
dOa Is often driven by single scull, held. not behind,
but the side OF the vessel and worked TO the right aud
pert gondoer propes and steers his craft with the same
paddle
CHAMPAGNE FROM PETROLEUM.-Th beauti-
full synthetic process by which Borthelot succeeded
binng moecule OF Olant gas with mOlecule OF water
and thus forming alcohol, has led TO experiments with
hydrocarbons OF tne MARSH series which, ~ II sdlu,
have resulted I'm the production OF alcoholic beverage
In this day OF authorizations IL may be useless warn
those who may require alcohol for medicinal purposes
against the OF any decOctOns containing spirit not
made from sugar, grain, or the grape The real safe
guard however against this class OF authorizations lies IN
the fact that chemist has yet succeeded in producing
from hydrocarbons, alcohol at low cost it can DO
made from Indian corn; and further, in the probably
that the large OF land being devoted 10 Nne-
yards Will result IN the production OF mild wines much
cheaper than "doctOred" diuons OF corn whisky con-
shutting the imitation.
TESTING STEAM BoMERs.-PIof S. W. Rob
nson Of the University OF Michigan proposes 90 the eng
neer who wishes to determine the pressure TO which h
boiler be worked with safety, the following very SIND
pie process Let the boiler be filed entirely fll OF cola
water, TO the throttle and safety valves and al
closed tight 10 prevent any escape Now by ghtingh
fire under the boiler, the water will be gradually ek
panded and produce pressure sufficient even 10 ruptue
the before the temperature OF the water arrives az
the boiling point. While the pressure is increasing es
the gauge pressure Indicator be watcheu ano
when the test pressure, which may be twice or more
times great the working pressure is reached pof
ton OF the water may be allowed To escape ana tbe
pressure reduced The pressure results from the fcs
that water expands by heat than iro at CORE
spending temperature. The process given above u AZ
tended with mach safety the OF the hydrostae
press unless the water be heated over 2l2o F. when
would not be required unless the boiler leaks Below TINS
temperature disastrous consequences would ioliow,
II the boiler should be torn asunder, inasnuch -
explosions result from the sudden expansion OF gases "
vapOrs