New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1857-08-17


American type. In making known the descrip6ss ~
the Silurisn rocts Of Norway BY Mr.TejeresN fIhW
recently shown how remark able Is the peristsecs :.
ss ave eSwsa
Isles and to how great an extent this resemhs~tue
type Is preserved, even when the Atlantic a trsvs1
and that the same strata In the crut of the Jon
az ain met with in North America The occurrence -
south Of Scotland Of the Macures magma al Hss ~
the Isotelus ggas Deikey in Ireland, and 81 tbs H.
sis of your Calciierous Sand Rock IL our ScSt..r
Highlands are all most satisfactory proof, hat de
with certain notifications the same a. In ,hs 49,.
realm OF Caractacus.
Excuse this hurried letter. and WISHING vos ..,,,,
cessiul meeting as your laoors and those NY ether
Believe INC TO o. RSoDEsiSk ! T. sS'kcH,seu
SoTr on FOSSILS BY J. C. sAirER, y.
The specimens previously sent from Durness we're
far from satis factory and though clearly psisose
They might indeed have been either Carbonifsesus
or Deyonian. although Sir X Murchson had offered
eiropg geoog zeal reasons 10 lead US TO suppose Aem
TO be Lower Surian forms. One cast In particular,
which was at first doubtuuy regarded as Mac,aes,
though it bad righthanded curvature OF the Hhos.
is row more properly referred to Raphistoms or Opat
could rot decide the But those lately collected
by Mr. Peach leave doubt 90 to the true age the
beds. The principal fossil will be particularly inter-
eating TO Canadian geoogists-being the same one
from the "Calciferous Sand Rock" Of Beaahanos,
and which, being undescribed: has received the Ms
name of Ophleta compdctz. The genus is donbtfu
and the fossil is probably only subgenus OF Rapk,s.
tina TIaIll-the species Of which have wide umbl-
Gus (bornded by very prominent RIDGE and sf-aght.
sided whorls. This species IN Canada grow al an inch
and hall wide and had many as six or seven wOrs
fat above and with sunk apex and very broad and
wide umbcus co that the center OF the shel "a pseh
a,teuusied and the inner whorls would essiiy preak
out as in Mr. Halls figure OF o. cerata, faL =, n
ka .h.,la of AT
less innate below and tae umbilicus not nearg1
wide O. compacta viii be fally figured and described
in a decade of the Canadian iosss-lt Is unnecSs6y
10 say more of il here. Ii lie curious that the Euou
phalus (Aaclurea Matutfna) which eceompanedtts
Beauhai nois fossil in Canada, is found also 10 The
Highland beds with another thick whoried species
Again species of Plearotemarta, known 10 Ameiica
as the Trenton Lime stone-the p. Subcoaica Hail.
comes so very near to of our fossils, that II might
well be only variety of the Species The Highiand
fossil has rather numerous whors, ana pefhsPss
broader band The genus Cacocerds, so chafactertuc
Of the Trenton Limestone, also occurs but of larger
species with more numerous septa than the U. Cos
,tycfuta. As the oacar, bees in Cansda frequently
contain the fossils Of more than one subdivision inc
Ney-Yo,k SERIES is not more than we should expect
10 find the above fossils associated In single thick
band of limestone II is most satisfactory to IND, IN
the norheIDmos part Of Scotland the REPRESENTATIVES,
of the Calcferous Sand Rock and the Trenton Lame.
stones-as In the South Scotland that OF the ChAxy
lmestone.t And as the ft rmer repose upon quartz
rock with abundance of fucoda Impressions, the sug
rest,on is obvious that such rock way occupy VIE
place of the Potsdam sandstone.
Nory Mr., G.. Peach Is now proceeding, az my
special request TO epdeavor to collect more fossiis
only at Durness but throughout the Assynt and oesr
tracts rto which the same imestons' and guartztes
extend. w. SAtILn.
Prof RAMSAY remarked that the Scottish rocks for
n portion of the great Scandinavian chain, that ths
gIessic rocks of that country are overlaa Just N
Norway and America, and that the fossils iouna arc
the same genericaly though differing specifically He
spoke also Of the probability arising from acompsrsr
of Bohemian with Scottish and American fossils mat
in the Surisn age an isthmus crossed the AtAnic,
dividing the north from the south OF both Europe ana
North An erica, row the Pacific and Atianuc are
separated by the Istbmus of Panama.
N1rIcE OF A NEW system OF DRESSING MErALtIc
Oars. BY b SMLiMAS, jr, Professor Of Ges'
eral and dpphed Ckemistry an Yale CoHege.
The object Of this communication was to describe
the general principle of sysem Of dressing devised
and put practice at the copper mines Of the Breto
Mining Company, in Connecticut, under the direcoa
The main features Of this system are: !. The perfect
separation Of the finer OF the product OF
ing and crushing commonly known as " siimc ors1
from the poi tons, without the aid OF siege,
or screens g The application of the welLknown sys.
tenn Of "jiggDg by the of Bradfords patent con
iiruous-acting ggs directly to the stamped ore, which
hitherto has been Incapable Of this mode OF treatment;
8. I he adoptsn Of such mechanical means as have
rendered the whole process Of dressing coutin
uous ard tanning system in which human labor
bears en- exceedingly small ratio TO the results OBJ
famed,
In this system the waste refuse material is disposed
of exclusively by gravity aud running water, without
handling, while the ore /. brought up to the highest
mercantile percentage, howeyr poor the originalofs
may be, appreciable quentity Of ore escaping 10
The first Of the above results a. is accomplished By
the use Of new and exceedingly simple hydroststic
apparatus, devised by Mr.. l.. Sta itmuller, Mining
Engineer to the Bristol Mining Company. A model
and sectional drawings of this apparatus shown TO
the Section. The efficient cause of its is the
movement of current Of water, in al inverted cone
ofiron, having an annuar space, surrounding an
inner cone the ere is admitted 1.-THE top and Is dis
trbuted conical surface TO meet the ascending
ut Of water which s adjusted in volume and
force by proper valve and by nice proportioning
Of the parts, that all the finer and muddy por
ton Of the ore are carried over the upper lip Of tho
appaiatus, while at the bottom escape with moro
iolcible current Of water, through an ajussbs
orfoe, oil the coarser and metallic particles.
These are entirely free from all slime and are dressed
upon continuous arrangement ofselfactng jigg, snd
are carried Immediately to percentage suitable fee
market. The proportion of the ore, about one halt,
cone, is treated by alternate subsistence in large
contest vats the denser portions from the bottom Of
which are dressed upon Bradfords ore separator "a
pan Of copper having the reciprocal motion OF the
when served with only the class Of ores properly
adapted to them, admirably successful and
economical The ores too fine or small 10 size for
tie sepaTaor are treated upon large concal table.
Of circular form, by means of very gentle current OF
water pead il thin sheet the table, thus clean
sing the last traces Of from the finer particles OF
mud with which they mingled.
This communication was illustrated by models ana
dTavirgs, and by samples OF the ore thus dressed,
showing in very decided manner the beauty ana
tiicoucy CT the system. I'D. r, :.
Col. WHnTuSEY mentioned the greatloss of metn
IN The processes used atlake Superior ana asked u
Pref s. could assure him that by his method there is
absolutely no mineral loss.
Prof. SILLIMAS was sure that no mechanical means
could be devised Of such perfection a. 10 secure spel
a result Loss is an inevitable necessity, but by the
.,.oo.s hi rednced almnst 20 ia loHet