New-York daily tribune., 1855-08-24

the gsous pec.en. He therefore nclined to reier
tefe roche to the Tertiary period East oil San FRAN
cisco AZ Contra Costa were similar sandstone, which
could be traced 10 BeDica, where he had found cas
of turi,els. He supposed hem to be the same as the
rocks at San FrsneFco. Both were Tilted AZ hsn an.
les the Beneia rocks rested upon gcanite ridges. IL
wes n erefore probable that there had been an up
Leaval since the deposition of these rocks. Mr. Blakes
oprion that these rocks tertiary was drawn out
by ques'ioDs from
Prof AoAssIz. who said that perhaps it not fair
to press such questions but when the intention was
good he tbought such pressure was not wrong. He
he'd that the fossil which Mr. Blake had shown indl-
Gated tertiary age as distinctly as any fossil ever ind
Gated tertiary age 1t was q scutea, genus that had
existed from the eocene down TO the present day. lie
believed from its form, that IL belonged TO me mel
ocene. The eocene species were more raised ID the
center Now, there were some geological features IN
Ills 6eposit of he utmost interest Tne first that
tertiary rocks of such metsmorpbc character as mus
were not known in any other locality IN tae United
States. Then, again, we bad tertiary rock OF very
seTpennoid character. Tertiary serpentne was some
thing very novel He would consider the serpentne
as something Of al altered sandstone but whether IT
were SO or an injection through the middle penod OF
tle tertiary il was equally interesting.
Mr. BLAKE said that all the indications led him to
believe that it was an intrusive rock.
Prof HALL maintained that the analogy between he
illustrations which Mr.. Blake gave and the occurrence
of ,er,eptire in the Hudson River Group perfect
lie doubted if serpentine an intrusive rock.
Mr.. w. T. BLAKE read paper on the Geology and
Mineral Association Of the Quicksilver Mine Of New
Almaden California. He gave general description
Of the rire and the character Of the vein The ore
is O. massive sulphuret cnnabar and is identical in
cornposition with the vermillion OF commerce. Ii ia
found in series Of beds nterlamnated w.h the slaty
rocks; some of the hard thales being highly charged
with the ore II also in long, irregular veins
traversing the rocks at right angles to the bedding
forming Beautiful specimens for the cabinet Some OF
the beds of reach thickness OF eight feet but the
tbcbness Of the series has not been ascetaned VEINS
Of car Donate OF lime traverse the beds OF ore and
fault all the small veins being more recent in its FORM
alton. The only minerals yet observed, are iron and
copper pyrites srseDcal pyrytes, cac spar and btu
men. Gold has also been reported. Tne rocks in
which this ore occurs are similar to those Of San Fran
CISCO and like them have the peculiar finty metanor
Ihic character. They are probably OF tertiary age,
and are associated with tr8ppean and nne rocss
Mr. al made further observations Oh this ore and
exhibited numerous specimens. The mercury is very
Iure and IL obtained from the ore by disuilation IN
clOfe brick chamber.
Mr.. BLAKE exhibited some beautiful specimens Of
crysaized and arborescent gold-some Of them found
in the Deigbborhood Of Suffers Fort. The arbores-
cence was perfect and of the cry stalls iuch in
diameter.
SECTION OF PHYSICS.
RESISTANCE TO the M0tioR Of me Pcndulum BY
BEsJAMIs PIERCE.
The Pendulum is not retarded by the air alone, but
by other csuses not yet fully Investigated. Prot.
Peirce offered several ingenious suggestions "a 10 their
nature and the mode of obviating them but the sub
ject is yet unfinished.
Os AN IMPROVEMENT IN "S@ 's*@ By
AL alleged important Improvement in ------.
Those who wish to know more of il had better consult
the advertisements of the putentee. Such cases Of
abuse of the purposes and designs of the Association
are so rare that long infcton quietly submitted
TO- but with unequivocal disgust.
SOME ADDITIONS to The ne~ Mode Of Astronomical Oh.
servations IN Right ascension and DeclinatioR. BY
Pro-. o. M. MITcHEL.
With the mode of taking Right Ascensions, de-
scribed before Prof Mitchell has combiI ed contrv
ance. partly automatic, for at the same time taking
decinations also with great rapidty.
FIRST AFTERNOON IN MATHEMATICS.
THE CArESARY on the right vertical cone. BY Prof
B. PIIRcE.
A paper Of pure Mathematics, uninteligible except
to the initiated
NoTIcE or TIDAL OBSERVATIONS made on the coast Of
the United States The GuJf Of Mezco, ruth type
cures at the seceral stations, and their decomposf-
tion INTO tie cutre Of diurnal and semi-diarnal
tides. BY Prof. A. d. BAoHE.
The stations are eighteen in number; at four, hour
at the remainder fer not less than two unations, and
gener ally for more The stations at Cape Florida Indian
Key, Key West and Tortugas, were intended to trace
the tide wave through the Florida Channel those at
EgmoLt Key, Tampa, Cedar Keys and St. Marks, to
trace it along the western coast of Florida at ST.
Georges Pensacola, Fort Morgan, Ca; Island and L.
Bay ou entrsuce TO the Missssipp to trace 1t along
the south coast of Florida Alabama, Mississippi and
part of louisiana at f. Bayou, Desien Isle, Calca-
tieu Bolivar Point and Galveston Arkansas and Bra
zos Santiago for the coast of Louisiana and Texas.
The observations were chiefly made by Mr. Gusta-
yus Wurderman with different assistants. AT few
station they were made by Corporal Thompson of the
Engineers, Mr.. Bassett, Mr.. TansiIl and MIR. Muir
The reductions made in the Tidal division OF the
Coasi Survey Office, by Assistant Pourtaes, Mr.. Cor
DON Nh. Mitchell Mr.. Heaton and others.
Tie methods used were those pointed out in my pre-
vious papers to the Association, the decsmpositions
being IN some made graphically, and at
paIt of the stations, where the semidurnal wave Is
consderable-tbe ordinary method Of waking being
used as well as those considered peculiarly applicable
TO these tides.
PHILosoPHY OF SENSIBLE HEAT. BY Pref j. W.
HoYT.
The kOto and eckot Of the forces never be made
out until the parcelng out of nature into thousand
different kingdoms, each with its own code of laws
and distinctive dynasty, shall give place to broad,
comprehensive, confederating philosophy. Simplicity
is characteristic of all the works of God and the most
mutorm results are often traceabe to unitary
thereby suggesting to that inst beyond the ken
of our philosophy lies iervd force no less simple than
mighty, of which the multiplying forces of pseudo
scierce are but go many tributaries.
TIE PHILOSOPHY of heat will be discussed in two
paits-ihe first including the ordinary Sources Of Heat
with general deductions as TO lis nature; and the
second devoted 10 The mode a epolreDeat.