New-York tribune., 1876-08-19

found Profs Foster and Whitney-who were pre-
pairing report on the Lake Superior region, WHICH
has since become one Of the classics Of geoogy-sent
some of the specimens TO a distinguished mineraio-
gist at Freiburg The German professor couid hot
believe that pure copper and silver were mus ~
socated in nature and at once denounced the "ho'e
thing as Yankoe ,rck. Among the fine ILLUSTRATIONS
in the Mineral Annex of this cuious comDiha,oh 10
a set Of miniature models of the tools used IN MINING
each of which is made of the two metals thus
naturally Joined in two or three places in each ool
Thus half an inch of the handle of pick Is rod Oh
liver: the next half inch Is copper; part
of tho head of the instrument is silver aRIin.
ard the rest is copper but the cpparent texture ~
uniform throughout as II the Whoie were oi oio
metal.
The gold ores in the Government Building
representative Of Gaorgia's mineral wealth. are
more numerous aid noteworthy than from Vagina
or North Carolina. The rest of tho gold ana siVer
specimens from the Eastern, sllddla an o"utN II
States are of no Importance except "a oh)eots vi
curiosity. But the mnng States and territories oi
tho West make up Tor all deficiency elsewhere ny
the abundance Of their display. Only small pro
uor,jol of this is TO be found IN tine Nam Bui!dug
and il two mineral anneXes The more interesting
and rare specimens chiefly OF silver ORES. lIec
is a building separately devoted 10 an oAh'p's o'
the stamping and crushing machmerV oi 'no
Novala silver mines. This ia furnished by
four of the mining companies ~ Is ho'
in miniature like the Gillian machinery.
The heavy stanperS do fullfcdgcd work o. the ores
prov ded with tho normal ancunt of noise; ard the
tritu,ted mass is duly stirred with grfa at coInIno-
ticn in large tank of water. Moreover, the VISITOR
caa here bay silver medals guaranteed ~ t" purity
of metal and rlad-so far tho extraction OF SILVER
il couccrncd-by the processes which re Witnesses;
tn, medals arp coined Mt the mint. To ma IAe
largest evhi5i. Of gold specimens we must - % 'iie
Government building, whore there Is neat l'ue
show OF them kept in an iron safe. rms lhciuoes
some CRYSTALLINE speeIons OF uotabse be.ht'' anu
. neat but not very largo display ot the ino'al itself
III various conditions fairy illustrative "t The Iorihs
in which geld is discovered The gold display ron
Virginia City is especially snowy. Tho illst ~
tonal Bank of Helena lends specimens or GOA d'l7'
nuggets, and quartz. In ssparaa eases ih the 'o'-
er,,neot Bpldnr each Of .he Westrfn mining States
aud Territories presents series " lS or'' CONTAINING
nrecin,s metals Nevada has u fri' set ci specimens
from the Comstock lode. and shows gold IA well IL
silver. In the California cabinet there are several
sn,cimeus whore the gold crops ont I" view on the
e,,pes and in tic seams. The M0ntansclse IL SIN
enlarly rich in crystalline iorms. Especially inter-
estip, to tho. minoralocist are the tcilurum ores
which Colorado exhibits. Telu-iun Is queer sub
stance belonging 20 the Sulphur and selenlum group
of rieia,lods and somewhat ro7e; IN fact, u mas
heeu over since Its discover scr5 or che!1e"l tl-
o,itv THIS is the substance ~ which i certain
,rofessor eat a small quantity and noticed
n;l, surprise for several days aiteruard
ttot his friends avoided lin. Finally ono
Of them. getting to tho wiDdward ana bury
ing his pose in his bandkor, h'ct, kindly cN-
plained 10 tho professor that he exhaied hoiIlo'
smell. Tho professors friends might nave p''h
-cc,rci,od TO his scent if they had known that
.b,usapds Of dollars worth # gold were to be dis
covered in conjunction with t"lluIinrn This re-
marKable association was -bret diaco'ereh III uo
locality n do famous hy Bret Harte's p0en-on the
banks of the - ,nisaus River ii California Tie tel
uric ores from Colorado shown III the Government
Kni,ding come from two different localities n thai
| Territory now u state one IN l;s southwestern
,ortion tie other uOre ne,Ily central ana S,nti "l
| Denver SoIne OF these ores - very nell Ni'i's
$50 900 OF gold ~ the ton. \" cA-1ai Fis't"E VIII
! be ami 10 mis- a line collective exhibit of mih'Fais
rath.rad on tlo hne Of the Central Pacific kaIh"aa'
as these are IN cases in the Agricultural Bm!dm4'
! They include many fine and valuable specimens o'
silver ore TO sca all that the Western mining "i--
tricts have sent il viii les needII also 10 I'ko =
pIaDcs in the Buildings of the States anu territories
II may he noticed that the variety IN silver ores -
represented IN tie fNhlDiJio- = i'i si'"''i '''
| oo1 This is not to De asc.ibcl 10 Ihc crcun,alr'
that silver il moro plentiful or more widely dls'Ih
mod Than gold bat rather o. the cherca! mature ol
.var itself II ia more TcadI 10 enter into colnhi-
/ n,tiops The most natural OF these ana tie oii,
! which is most abundant. il indeed II Is no'
I'm. ,,-i,uul one from Whlch all oI nearly All TIC
others are formed, Is the back snl,h'i" oi NiN'f
| This meeting with water charged with different
sails or i'm driar situations exposed 10 atmospheric
| iuIiucrce. undcrgoes various changes some %
which are immrdiaIs su0Siituhoh'' "hlc "'n'i III
consecutive The Rst step i, frequently oxidation
fro.. sulyhdc to sulDaate. I'm case %! inh} AH'''
ptuony mas takon the place % part oi no 5niN'HI
In "horn silver the chlorine has d"ubti''' h''I
supplied from salt water, producing tonGh sub
stance. usually r Coaings and sheets maj cu' iN'
wax The 'od,Ge aud bromide ores are OF ccnI5' t"'
result OF similar processes some OF these Change
are actually going at the present day III tho Com
stock mines, evolving temperature lIcie "iioh J.
fr.htful 10 contemplate even ai'er inc ne'l'd tern
Of this Summer The miners there have 90 he KEEP
We; with streams OF cold water, and even With ih
advantage cannot work in the hottest seams 10
more than an hour tw- at q time. Tins neat d
the direct rroduct of chemical action. 10 sioui'
furnish strong argument to Lhe more moden
tbaory Of volcanoes which dispcnses with belief II
the central fires Of tine globe. W. c. W.
THE CHILDREN OF TIE WORLD.
TIE METHODS or INSTRUCTION ~ TIE PUBLIC AM
TrcuyrCAL SCHOOLS Oh TUE UNITED STATES.
ip.,v SPECIAL CORRESPONDENT OF rnE THHrSs.i
| PHILADELPHIA, Aug. 17-That anxious look
ing foreigner whom at every turn ia the EAhi
bton and ysao has not yet made up his mlnd whethe