New-York tribune., 1876-07-22

m the f,Vovif sll Iiect: wise the theory of the
satellites of Jupi'er; discus ,he observations, and
icdnce the constants which depend upon then
especially determine tbe ye,D-ity of light finally
construct special tables tor each SJclite'
FyAMFrING on Brass AND GERMAN SuvEE.--
The adhesion Of enamel to brass and German sill
ver it is said may be most perfectly effected by rs
engraving or pressing the design tobc enamced into
che alloy and then coating the whole object or only
the depressed lcS cu. calv0ocally with copper The
enamel be fused dp0u tiis surface as usual ahd
nay then be brouzed, or silNercd, or treated III any
usual way.
The LAIANpC PRIZE.-Thc Lalapde prize vt the
French Academy IS given yearly TO the astronomer
who shall pablish the most useful memoir or make
tho most important observation. This has been
awarded for 1879 to NJ Perrotu Of the Observatory
of Toulouse for his astronomical observations, and
particularly fOT his discovery OF 9SttIoi"N' me
brathcTs Henry OF Paris auq MAi, t"St.y ana Co--
On OF Marseillc~ have received this medtl IN pre-
vous years for he same kind of labors, as has also
Prof Watson of Michigan University.
CnEAP ouINISE.-lt is reported that tn extensive
ciuchona plantations in British Si&bim have lately
begun to furnish an efficient febriiuge, sold at a
cheap rate. the resident manage, Of tie plantation
at DarceIine writes to Dr. Hooker that they expect
to collect about 90 tons Of the dry bark during this
season; that they are making IL on the spot inio a
fcbuiuge, which is evidently g0ite as tHcc'uii a.
Week and expect to increase the quantity, ana nope
t. sell TINS at about 80 cents an ouhcc'
P,N1rnTs DR.GoMrTER.-Proi PalmieTi has con
structed an Instrument which he calls "oraEome-
tcrp Iii intended to determine the character OF
oils ard textures by means OF electricity. Among
the properties claimed for 1t l. Ii will show the
quality of olive oil @ II VIII distinguish olive oil
i,om seed oil 8. IL will indicate whether oiNt on,
although OF the best appearance, mas Deth iulNeu
q lAlsft ltsa
oils . Finally il will indicate the presence ol COT
Ton in silkeu OF woolcn textures
GRAND PmzE or MEDICINE AND SURGERY FOR
1S75-The grand prize of medicine and surgery of
tbe Academy of Sciences of Paris has lately been
awarded to Or. Onimus for his researches upon the
therapeutic action Of electricity i'm winch he shows
the effect of the elecrizaton Of the upper ceryicai
glngou in the inter-ocUlsr circulation, as well as
the influence Of continuous currents IN the atrophy
of the optic nerve, accompanied by a very decided
benefit in several cases lie has also inquired lnl"
the influence of the direction Of continuous currents
OF the reflex medullaIy action, and the employ mehl
o. electricity rs daglpstIc means ne Hl4HntS
a So into the difference of ntermltted and OF cOtn-
uOus currents upon the economy.
PREVENTION OF Boiler observation-disclosures
proposes the use Of metallic zinc preventive OF
boiler incr,tstation. Twenty Kilograms, intro
dnced into boiler Of 100 horse power is sufficient
for at least three months. The zine disappears, and
whatever is deposited from the water forms no crust,
but only a loose mass which easily be waShedout
Tie mode Of action is not yet explained but NJ
Lesueur supposcS electrical force To be involved \
paivanic couple may oe formed Dy the Zihc WIN 'he
metal of the boiler, ttat ht'ie water would ne
dccompo,ed. Thus film of hydrogen might be Pro
duced and continually renewed on the surface OF the
iron, preventing the adherence OF any deposit
BLEACHING SPoNGEs.-Spongas are said to be
beached by the following process, without the
emission Of injurious unpleasant gases: They are
first covered with hydrochorc acid for the removal
Of caIcareous matter and. after being washed with
water, are Immersed for five TO ten minutes IN a
solution of part of potassium or sodium periadn-
ganate 10 - of water N which they acquire dark
brown color which disappears ou lmnersing them
ior one to two minutes III solution 0l pay ol
OXalic acid in 20 parts OF water With the adGitloh
OF httle sulpluric aald. IAey are lheh tholunsiA
washed with water HE brown color acquired ihaF
Rlsl be removed without injury by repeated lmiler-
siols tor several minutes ~ very uIu'c SuipHhlc
acid.
BPONZrvG IRON CAsrI> Gs.-A process for bronz-
Ing iron castings, patented IN different contgics by
Gaudon. Mignon and Bonart, differs FROM preccd-
ing ones in dispensing with the Intervention OF a
third substance and at the same time rendering the
lm OF copper so adherent that it viii not scale of,
but m some cases the iron and copper have been
found 10 scale off together. The film is also said to
be perfectly uniform in thickness upon the eleya-
tions and depressons and tho un@crcut portions,
and capable in the hands of a sia!iful worKman, OF
acquiring close resemblance 10 bronze. The pro-
cess has been employed al tie large ounderY ol IRON
ornamental work at Val OOSHc, on castings OF all
sizes up to colossal statues, some OF when nave
wltlstO0d the weather fer summer and two Wln-
fcrS without the least INJURY. The cost Is not more
than double that by the usual process. 4 slmuaI
method may also be employed tor unhlng copper ana
cast-ITOn vessels
COVERING TIE SLOPES OF THE ALPs WITH For
Esrs.-Among the objects exhibited at the recent
Geographical Exposition in Paris is series of maps
illustrating the progress in reclotLing The slopes in
lle Department OF the Bas5es-Alps with growth OF
wood this relating especially to the basin of tie
torrent Of Bourgct, commenced in 1869. Consider
able time was occupied by the preliminary surveys
but the process ofrepanting mas already begun with
such effect a. 10 insure the protection OF the hamlet
of Bourgct. which had been threatened with de-
stuuti0n By being washed away. Inc luhUcnee
exerted upon population aud human existence by
decreasing or the destruction Of the woods IS shown
by the fact that in 1916 the population of one De-
partneut IN the Alps Of France amounted 10 10000
persons while in 1sI2 only $4,000 could he emu
ip-rsied 10000 having been forced TO remove else
whore in consequence OF the decreasing quantity OF
fertile land.
NATURAL DEVELOPMENT or SULPHUfETTED iY-
ppoGgY-Faul0uicr narrateS curious phenomenon
which has taken place during the Summer Of 1879
at P9iayas near Montpelier. In the vicinity of this
place are extensive salt marshes, which, in conSe-
oueuee Of persistent north Winds have barone a.-
mos. d.cd uy. TIE accompanying heat OF the season
has produccd q rapid decomposition OF tle organic
r..itsrin the soil, which has been accompanied Toy
DEVELOPMENT OF suiphuuttej hydrogen. The exist
e-ce OF this gas has been very pIp3h't TO th'
senses. and hasalso produced an uueA Peciet iuU-
oI.ca uuun l1c residences .'ar h', t-' pif'tu ebi-
.., of Iac houses having lis. lAr.t" 'io"u am"
|.. H.r lHl l.. f ..