New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1873-09-22

the Falls during the Summer months viii have his
attention called 10 the immense number of young
cells of few inches In length writing abOnt the
slippery rocks along which he is passing unaer OF
binary circumstances these fish find little dlihculty
in ascending falls, by making their way through
the interstlces of the rocks even by crawling OUT
at night, If necessary and thus passing on 10
higher level This feat is impossible at Niagara rs
shown by the absence Of eels in the waters OF Lake
Erie The cells remain in fresh waters probably TOT
period of several years, until they have reaeneu
a considerable growth. They then begin Their
descent and are often taken in immense numbers IN
the Fall of the year. in baskets aud otherspeca con
tTivances for their capture. When they get Dafh W
the sea 1t is probable that they relnah tc,s
So much has been known of the general facts
but the precise nature of their reproduction mas as
stated, been until lately mystery. The anatomy
of this fish has been frequently lnyestlgated, 9I ~
Was not until the labOrs of Cruveli and Maggl that
we have come to anything like a clear understand
ing of the process The somewhat startling cOneln-
sion is reached by these gentlemen, that the eel u
strictly hermaphTodite and that eggs are fertihzed
by sperm in the body of one and the same indlVuu
al. Prof Ercolani has repeated the experiments Oh
the gentlemen mentioned, and while dliierlhg So on
siderably in his conclusions as to the morphology
and functions of the several parts, agrees with them
that cells are complete hermaphrodites, wheh we
NAV therefore consider as tOerably well established
Cruvelli and Magg find q very curious distinction
between two species of European eels-the lhte t
tines in one being almost straight line, and IN ine
other being very hexuose these differences oelhg
accompanied by external peculiarties i'll the rela-
tive position of the anus.
TIMING, COPPERING OR SILvERING BRASS, IRON
ZINC, &c. BY THE WET METHoD.-ln memoir Dy
c. Paul on the best methods of depositing one metal
upon another, informed that the operation Oh
timing brass copper and German silver articles, by
boiling in a tin solution, succeeds best with soiu
ton of cream of tartar in enameled iron vessel
to which pure granulated tin has been added Ii
sufficient tin be employed and the liquid frequently
stirred the coating will be heavy enough after boil
ing two hours 1t is best to place the articles III the
vessel first and to scatter the tin over them. Iron
articles as buckles nails &C.. may also De uhheu
in the wet way, by a method less generally KNOWN
II is however essential that they be first thorough
" cleansed by dipping in mixture of part nitric
acid and 10 parts water then hghily coateu WIN
copper by adding, gradually lin more than an hourl
to this liquid only much of solution OF suipnaIe
OF acetate of copper may be necessary SLOWLY "
produce a very slight covering OF copper lhey
must then be rinsed and more heavily cOppered by
wetting them uniformly with solution oil part OF
proto-salt of tin parts water, and the addllon OF
parts muriatic acid allowing the excess to dram OIL
and then shaking, rubbing, or securing them WIN
solution of ammOni-sulphate of copper. ms Is a
deep blue liquid obtained by dissolying part sui
plate of copper in IL parts water. and adding hrst
anmonia until theprecipitate formed at first is re-
dissolved, ana Iutl pONuClCu Nhtiih' nv N'PfN'
deposits rapidly on the iron and is very adherent.
The same process answers for zinc with the omission
If the treatment with the tin salt solution. The
iron and zinc articles thus copper-coated can then
be timed by the usual process; or still better, in
q solution of parts cream of tartar and one part
salt of tin in water by first sprinkling them thinly
with zinc filings, and then pouring the warmed tin
solution over them. The latter liquid must not
be too strong and it is therefore best to add the
concentrated solution of tin salt and cream of
tartar gradually, drop by drop, so that the
tin coating may form slowly ms sh0Mld
appear of a beautiful blush dead white. lhe
objects must remain an hour longer in the liquid,
and then be rinSed and dried lthe smaller III saw
DUST Brass, copper or German silver articles,
polished freshly cleaned in an acid bath, and also
coppercoated IRON and zine ones, may be slVered az
follows Dissolve 2l0 grains OF silver III 3yO grains
nitric acid and 1900 grains cyanide OF potassium IN
one quart of water; mix the solutions and add ago
grains powdered chalk. Smooth objects may be sill
yefed by being rubbed with tins, with the addition
of some Spanish-white Chains and small articles
may be placed in an unglazed earthen vessel ana
strewed with whiting, which is then moistened, and
the objects shaken about with 1t. and then as
much of the silvering liquid gradually added as
may be necessary until the coating seems UNIFORM
and sufficiently heavy. Brass, which Is 10 present
both dead and polished surfaces, must first be dead
ened as follows: Saturate one quart OF nitric ACID
with zinc. mix sulphuric acid with hydrochloric
until eeTveScence Ceases and add onetblfd rs much
of nitric acid to the MIXTURE and then as much OF the
zinc solution may be necessary to produce dead
ening liquid of the desired quality. The articles,
after being dipped in this to be rnsed, and then
frightened by covering with snuff and dipping in
pure nitric acid withdrawing quickly, and immedi-
aey rnsing in plenty of water to the last portions
of which il is well to add solution of cream of
tartar; they are then dried with linen or sawdust.
The polished parts must afterward be FURNISHED
with blood stone To impaTt the dark gray color
and form the so-caled oxide the portions to remain
uncolored are first protected with a coating Of wax,
and the parts to be colored then penced with sui
phide of ammonium. Moderate warming hastens
the colOring A bronze tint may also be impaired to
other metals in this way. The finest effect is pro-
duced with gold; and slvered articles may be first
glded Tor tS p9rposei Dy Ilhelsng tnel " oatn
grains chloride Of gold, and one quart of water
slightly aeidiied with hydrochloric acid. 1t should
be slightly warmed. The deposit of gold immedl-
ately formed answers the purpose OF producing the
blush TINT with sulphide of ammonium. A heavier
film can be obtained by this bath with galyanic
current