New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1851-05-12
AFTERNOON SESSION.

|
| febsoT l.. AcAssIZ OF Harvard
? On the existence Of Phosphorus in certain DeI
Mones Iron Stones, by Doct ID OWEN. U 4eOlogist
othe Chippewa Land District TO be read by Msor RICH
5 On a method OF di.inR gushing between Baxal aud
Gns1is Crys.s: when in thin Plates and the Te,u Of
| WILLIAM p BLAKE, Of New-York.
q. On The Superficial Deposits OF the North West, by
CHARLEs WHTTLEsEY, OF the U s. Geological Survey Of
5. On the Drift Phenomena OF Lake Superior, by q.
DEsoR Of The T. s. Geological Survey Of LsEe Superior.
! shall try to give you abstracts ofthe more i'm.
portsnt of these. The first evening session will
be held this evening, when Mr.. REDFIELD will
read interesting paper on The Earlier and
Later Progress Of American Railroads - aud Mr..
J. w. FOSTER explain the different Systems Of
Elevation which have given cOnhguration 70
| North America. AN.
EVENING SESSION.. .CINcINSATI, Tuesday, May 3.
The Evening Session was well attended by the
| citizens of Cincinnati and the members of the
Association. A number of ladies were among the
auditors.
The order OF papers to be presented having
been changed, owing to the unprepared state of
those first announced the evening was occupied
by Prof JAMES HALL, State Palgontologist OF
New-York in a communication on the Paraltelism
of the Rocks of Ne0. York aoith those of the West
ern States, and Of these ruth the Formations of
Europe.
Prof HALL commenced by abiding to the state
Of Geological research in times past and present
twas difficult task, twenty years since, to de.
fine any formation below the Coal Now, how
ever, later Investigations have largely added to
our knowledge Of the regular series of strata be-
low the Coal formation. Prof Hall sketched the
progress OF these Investigations, particularly as
made in New York, under the patronage of the
State. large portion OF the rocks OF the middle
portion Of the State were referred to the New
| Red Sandstone. Twenty eight or thirty series OF
formations were found below che Coal-beginning
| with the Potsdam Sandstone, the lowest OF the
sedimentary rocks, resting upon the gnelssold
| rock bat which contains no fossils general
| correspondence waE observed between the orma-
| tops of Newly ork and those OF the w estern
| States Groups were found traverslng New
! York to the Mississippi River, with lltte altera.
| ton The difficulty of recognizing the groups OF
! New. y ork in the West has arisen from the tact
that groups recognized as syttems In Newly ork
are not recognized here at all. Prof. Hall Illus
trated this by reference to the Onondaga Lime
stone which is found identical in Ohio and New
York. 1t occurs in the region Of Columbus, the
Falls Of the Ohio and the Miami Valley. Paleo-
zoic formations similar to the Hudson River group
are found in the vicinity of Cincinnati, and are
DEPOSITED in the same circumstances throughout
Numerous CephaopOds OF the character OF the
Black River Limestone OF New. ork are found
on the Mississippi River.
The question that arises upon the consideration
of the facts is, whether We shall group all these
distant localities together, or adopt different
| nomenclature.
THIRD AY...WEDNEsDAY, May 7.
The Association met at little past o'clock
this morning-President BACHB in the chair.
A number of invitations were received from the
public Institutions of Enthusiastically from
Western Academy of National Sciences, to ex.
anime its Cabinet the Mechanics Institute. ten
dering the free use OF it's Library and Reading
Room and from Prof Mitchell, to visit the OBJ
serv atory on Friday afternoon and eveRins
The president requested OF Western NOM
bers that specimens of the deposits OF Steam
boilers on the Western waters might be Tor
warded TO Prof Alexander OF Baltimore, VINO Is
jointly engaged with Prof Cresson OF PhIiadei-
phia in the nvestig alton Of the causes OF Explo-
sions, &c.
Prot. AGAssIz made the first scientific commu-
nication Of the morning. IL was an interesting
description of the " Special HOm0IogteS Of Aceph-
ala proiusely illustrated by diagrams Intimately
connected with his explanations. Being OF q
purely scientific character and not cslcustedto To-
terest the generality OF readers l must refer the
curious to the published Proceedings OF the Asso'
ciation-one of the most valuable serles oil Puoii-
Tbe next nsper was upon New Method OF
GeometricAlly Constructing the Indignation by
Qusdrstures," by Rev. Ia. HILL, read by Prof.
PENCE. The following is an abstract
NEW METROD or GEOMETkICALLY CON
sYRUCTlNG THE INTE6RATI0N BY QUAD.
RATURks
The spirit Of this method consists in construct
ipc the arc Of the curve from its radius OF curva'
ture which represents its ditierentlal coeihclen1
provided the variable lie represented by the angle
which the radius makes with q fixed axis. The
fnnc,ion 70 be ipteersted must be regarded as the
arc of another curve, which 10 not however re-
ouired 70 be actually drawn but substitute for
II NAV be found IN al isoperlmetrical poygon,
which nay have as many sides as we may please
10 give IT, This poygOn Is 10 be taken as the In
volute Of the required curve winch represents tue
integral, and this method is especially adapted 70
the indignation of trigOnometrlcal tanctlons'
Prof PIERCE remarked that Mr.. Hills method
NAV be shown 20 have a simple and neat cores
popdence with the analytical method OF quadra'
tures adopted by the beat geomesers and espe.
ciAlly with those adopted IN the Persuroasons oil
the asteroids. IL may alec be made 90 illustrate
,on,e of the ulost reconcile of the problems which
occnr IN planetary perturbatioAs, and especially
What relates 70 the equations OF long periods
Prof. BAcHE presented the results OF q" Com
n.ri.op Of Curves showing the hourly Changes OF
M.s,e,ic Declius,ion at Philsdelphia, Toronto
anG Hobar,town." The observations were made
- philadelphia az Girard College IN Toronto at
the Toronto Observatory; and At che OoserVAso'
" IN Hobarisown'
Prof PIERCE cad & paper by Mr.. J. CHAsk Of
MASSACHUSETTS, on -. -,-,
Curious FACT IN RELATION TO THE TUR'
BlNE WHEEL
In computing the experiments whion we're
made ut Lowell in the PFesens year. ~ ~. 81 "a
ia. IL was found tina, when tie gate wss 'uuy
I Og "