The evening telegraph. [volume] (Philadelphia [Pa.]) 1864-1918, 1864-10-22
FOREIGN SCIENCE,
Discussions In the Paris Academy.
MAD DOGS.

Discussions In the Paris Academy.
MAD DOGS.
Ata recent session OF the Paris Academy of
Science, paper was read on hydrophobia which
recommended cupping of the wound The
Secretary of the Academy, however, remarked
that cupping had already been tried and a report
been presented on the subject to the Academy, in
which 1t was shown that IN most cases the effect
Of this operation was only suspensiVe that is,
that IL prevented the absorption Of the virus until
other therapeutic agents could be procured to
dIssEoy IL.
SUBSTITUTE FOR STEAM.
AT the same meeting NJ. des Essarts sent in
paper a method of his for nsmitting the |
oscillsting power of the waves of the sea to GER
tain apparatuses placed on the beach, which may
b substituted for steam engines in the various
workshops Of arsenals.
FALLING STARS.
N. CoulyieT-Grayie communicated table of
the falling stars observed between the Both OF
June last and the l4th of August, the period
when this phenomenon occurs with extTdord-
nary frequency. From this table it appears that,
while on the 3Oth of June the number of Stars
that fell between IL O'clock and midnight was
only four, the 10Th instant il rose to seventy
three, and fell on the l4th TO twenEy-four.
cEAESTISu IRON.
A paper was received from M. Caron on the
cemCn alton OF iron by the oxide of carbon. From
his experiment it appears that iron may be made
to absorb any quantity OF carbon By means OF It's
oxide. Thus gramme OF oxide Of iron being
subjected TO reduction in hydrogen, yielded
seyen.t6ntbs of a gramme of pure iron. This,
after being heated for au hour 10 oxide Of carbon,
weighed nearly a gr4Wmc; after another hour Ot
The same process its we Shtrose 10 z, ANNE aud
q half; after n rhiTd hour, TO two grammcsj and
so on, until il reagbe the weight ofthrea grammes
after the sixth time. Nearly the whole OF this
increase Of weight is owing to tue absorption Of
carbon, the rest being very small prop portion OF
oxygen
Mr. Renault sent in paper on the chloride of
copIer obtained by dipping piece OF copper into
solution OF perchonde of iron. He sad,
"Ihis chloI de, which is gray ish white, gradu-
ally bee mes dark under the Influence OF HRht
aId WI even turn black, assuming metallic
lusre similar 10 that observable on a fracture OF
Pru ian bue. This property appeared TO M
Renaul applicable TO the daFuGrreOtype process
he atcordngly placed negative on pate OF
copper s,nsitized with bichloride Of copper, and
obtsineC p sitive print Of remarkable delieacy
witt out aIy incOnycnient metallic !ustre, and
much more agreeable to the eye than common
CRguereut5Ies.'
WELDING BY HYDRAULIC PRESSURE.
series of experiments has lately been mad
In Paris by NJ. Dupuriaii, engineer in the work
chops Of the Western Railway tO ascertain
whether iron might he welded Dy h. draullc pres
snre, instead of by the sedge-hsmmer. The LAT
ter, indeed, has Lot sufficient impetus TO re ic
the very core Of the metal, while contnuou
pressure acts Indefinitely TO any depth.
In the expetiments alluded to, NJ. Duporta
caused two iron bars, an inch and a hall !
diameter, and heaed 10 the welding point 70
placed betwe en- the piston and the top oi ny draI
lie press The bars ere welded together Oy Ia
means with cxt'aOroinary case, the IRON Deinl
as it we're, kDeadeu together, ana ul3ing out I
the sides und the pressure. The acton or u
press was suspended when the part welde
together was brought down to the thickness
the bars. After cooling, the welded part was G.
through TO examine the inside which was tour
perfectly compact. To try II, one OF the halN'
was placed Unter torge-hammer weighing io
kioerammos and it was not until The thu
stroke tha. the Welding was distinguished
ALUMINIUM.
NJ. Co,belli has discovered q new method {
obtaining this metal at q very small cost. h
plan !, as follows
'He takes certain quantity Of pure clay, s.
IOc grammCs, and dissUlves II in six times
weight of concentrated sulphurc, nitric, or hydI
cblOIic acid. Tho solution Is chen allowed
siand, ana afterwards decautCd. The residue
6Ist cried anC thtn heated TO 40 or 500 degre
CtnGg adc aftCT s. licl IL is mixed with 2
gtsmmes Of pIussiafe Of potash, which m
be increased or diminished according 70 {
quantity Of sicsa contained I'm the clay.
this mixture 100 grlmmcs OF common Slt q
added the whO'e is then pu. into q crucible
heated until the mixture becomes white VIII
cool, button Of pure aluminium is found az
bottom Of the crucible."
ouN-coTroN.
This substance, which for the last twenty yes
and upwards has been the object Of minute iny'
tigatiOn, IN order TO test its value as an eNplOsi
agent, has again been brought under the mott
of the Academy of Sciences by MN. Pelouze a
Maurey. Irmay De recOllected that AZ the me'
ing in 1868 Of the British Association, very il
pOrtant discussion took place on this interest
subject, and facts we're disclosed calculated
stagger the most determined opponent ofthe ne
material In opposition 20 these facts the eXpe
ments made 10 France in 1916 were quoted viii
seemed 10 prove that gun-cotton NOT only spo
the firearms in which it was used but was al
subject 10 spontaneous explosion but 20 this
Was replied that since then General Lenk, of q
Auslrian prmy, had introduced great improv
tHE HtsRE into the manufacture of the Article az Iii
-sssspsigi ~ apu that the gun-cotOn Of that pla
Svnlosss ass eenseet 70 spontaneous decomposition
f;S;ssen. shd Offered even In ts chemical cor
PooaJo'i PSo % iIom that made In France at the GU
PgniLs. marlekaetory Of lie Bouehet The co
S1a i.1snSe IN the paper Of NM Pelouze or
"COutrary to General Lepl,s asss,,,o, .,., !,
-gun-e 0tton does not explode Al los ,s1 .la. =
ture than 1876 degrees Cenfigrafle ths 20 p :
that all their specimens exploded or vsya o,h az,
wise decompOsed at temperature OF l00 Ssas os.ss
and that at temperature Of 100 degrees deeo,
pOi iitiOu ensued with equal certainty, but onlv
the coarse Of q few hours. In one case they sy