New-York daily tribune., 1856-08-28

a.o: oso -ta,psr .be direction Of .hc plumule and
radrle v.s rot de;, 1mir I'd by something wtoln ths
.etd IN order 20 obtain some anaogy 10 me tInss'
arms sud other er:emities o.. the o91ies Oh aailnas
He ,oyed c.essts E flower pots, IN different po'toh'
and tie plumule always grew up while the rsdicie al
ways grew down, into empty space II there was ho'n
ing else there. ,..-.... 49, v;,.;,or
Prof AGAssIz then gave dsquisnon on Nlyipar-
i,v and Oyipar.y which tis researc-es in Em5ryoogy
hsye thrown great light on. Al one hIe II was De-
Teved that th9se anina,s which brough: form thelr
Young slive had pecuisIlties which lndicateo eA
elusive relationship. The progress OF emDiyo'os "aa
proved that there was 10 such relationship ana no
radical difference between viviPaIous ana oVl2a,ous
,,imsls. In the family of snakes there were Wv.
parous and oviparous genera. The vipers brought
forth their youpg alive, but they were no more lise
qaadrupeds for al that Amopg quaarpfuS pt To- .Se
narupal. w en- first born, we're carried about oy me
mother, attached TO the npp'e, until tIey weie were
capable of being born sgain ana standing on tn.li
own legs Pacental connection between m)thtI anu
yourg was Of no considerable consequence. onHl ~.
slowed tha.-some oviparous though sharks bad not
many eggs ike most fishes but few and large IN pro-
portion to their size, as those OF hen some Nivp-
arous without place Ltal COZ ounection-and some WIN
Yet the mode Of development IN a. three was pre-
ciselv The same and was shark development.
There vss nothing in il which was allied 10 that
OF birds in AMI nsls. This lad decided influence On
classification. There was no reason for separating tne
msrsupials from other mammals In each group ana
der.r csss the relation between the modes OF devel'
opment inc cated the real relations OF the ablmas.
Animals winch were developed N the same manner
were sure to be found the end to belong 10 toe same
general ciysion. He would maintain this, that the
distinctions founded on complications OF structure
must be given up for general cAsshcatiOn, anC con
fired 10 the misor distinctions. This was moo,ucl
ton of the system OF Cuvier but be trusted 'ha we
shoulo not much longer be compelled 10 depend On
complications of structure for general dvsone, Ou'
hsve principle over which there should oe 10 pos'
biiy Of discussioD. " -, -,
Piof H.LDEuAv had been very highly gr,ti' with
the remarks Of Prof. Agsssiz. What would he 40
with the OvpaIians and NivIpsrans now
Prot. AGASsiZ sale, that among ovlparou' aninas,
there g,eat vsiety ftypes, some oi when were
ovipsrou Us, and vice versa. II,
put the marsupials in the class Csrnvora
Prof. AGAssIz laid that he would.
Mr.. DasrRL V,UGuAY then spoke on the ab'ence
Of tres from prairies Wood he said, grown on
I.no subiect to crouth, was fsr le,s durable than
that grown on moist land. lie supposed that TINS
etgeDracy might extingulsh race ,f trees Prua-
ing oinni, he1 the power OF plants to resist crouth
In the cry sason Of 1854, those grape vines which
were piuned least bore most. Dry winds were favor,
able 10 he formation of wood and the north sides OF
tr,es much rmer On this account, they oeinS
more exposed 10 dry winds, that wood cutters much
preferred the south side, when two were cutting az
one tree. as 1t wa more sot and spongy.
rHE SECTION OF PHYSICS.
While waiting Tor room into whlch tue
chenhts and me'eoroeglsts could swarm mere
organized by The Rem'nen p,i Cna%an 1dox 'pns prcs
dent Of tie IDyersity of M.-ssipp IN place OF Judge
Long,trcet, bur heretofore Professor o. Mathematics
ard Ast onomy in that instiiuton) Prof. Perce also
appointed Prof. liorshrd Chairman oi The S"o-Sec
ton when the Section should be divided.
MI l.. Il. ELLIOTT OF Il, ston tIen gave an account
of bis abOIs upon the Prnssan Mortality and other
tables, mp sDg part OF series OF tables mat are
prepared, beng prepared, at the request OF the
New Eng land Mutual Life Insurance Company OF
Boston, from official returns made II the Eng.lsh,
Swedish, PIussisp, and Belgian Governments, and
om such reliable American statistics as can be oO-
tained. In several of the United States, while the
returns Of the living sufficiently trustworthy
taose Of the numbers dying are sadly den
oient. The present Secretary OF State IN Massa-
chlsetts has consented to change IN the regis
tratiOn report for 1855, which Will AFFORD better
material for the satisfactory construction OF iietable
for the larger part of the population OF that common
wealth. Mr. Ehott briefly Indicated the nature OF tue
tables preseLted aid the t)Imua and process tor con.
structop. He described the more common methods OF
calculating life tables, aud ion'rasted them with im-
proved methods of bis own, illustrating The difference
b. diagrams representing the intensity of isoaty IN
various comn unities by curves. He discussed diner
ent methods for deducng from the ratio Of the dying
within certain intervals of age, T. roblbty THAI one
vn a. the earlier age viii attain the latef eha indi-
cateo en- accurate method for accomplishing that oo-
iect whether the deaths fer the period be variable or
uniformly s,rlbuted throughout the period. lie also
gave .L abridged method for computing the average
ouraton of e life annutes, and ether use fu taDes'
from population and mortality returns, which re- uces
the labor of weeks to hours, bu, gviog results anos
Identical with those obtained by the iiou. moaee OF
Ipolaon in common use; the average duration OF
fe for example, calculated by the shoet method sell
dom differing three weeks from that calculated by the
usual mode
The 5. elton then took up the discussion of La Places
Nebulsr by he5is and Prof. PIERCE gave full IN
terpretation of his views upon the question. lie
Il ought that by stating with present phenomena de-
cuciDg from them the required notifications OF the
Nebular hypothe ss, and then seeing whether those
MOD icatoDs possible or probable, we sloud OBJ
81, af tIn ffanlf
Among other illus' STATIONS of his ARGUMENT he in.
s'erced the eccentricty OF the planets BY the Nebu-
lar Hypothesis there should be at first but little
tricty, aud in nsture Neptune has scarce any. But
Neptune would prOuuce slight perturbation in the
next ling, and Uranus would have, it has sghtiy
more eccertric orbit. When we came to Jupiter, his
iDmeI mass would produce tidal currents in the next
ring Of extraordinary character and we have there
the group OF asteroids with their eccentric orbits.
MeIs being imaller would peruIb The Ei,th's ring but
little, and the Earth has q email eccenricity. But
again, Venus being go large In proportion to Meroary
would give that body the highly eccentric orbit it
has.
Prof PIERCE gave other arguments 10 support of bis
posliion, and a conversation followed. in which Mr.
VAUGHAN AID Others took part.
Prof. B.cHE and Mr. HILGARD then read paper
entitled Discussion of The Terrestrial Magnet. Ele-
ments for the United States and the Section adjourned
In the Subsection of Physics, Chemistry and MeteO
rology, DR.. WoLcOTT GIBBS read ext acts rou. very
long paper, giving the result, Of those researches
which he and DIR. r. A. Genth Of Philadelphia hsd been
conducting for yees into the nature Of those Pc
culiar bases formed by the union of ammonia with the
sesquo1ce and sesqnichoride Of cobalt. He read and
spoke with ges, rspdity, but with great cearnes Civ
ing rst notice of the results of previous
then pessed TO an Of their own researches
In passr be alluded 70 the value of the chromotho.
grsphed scaes of coor, devised by Cheyreu and also
to the value Of Ha dingers dchroscopc lsws, which
brought out among other valuable re-us the vory
eli gular result that in compound cobalt salts the ord
nary image always psrtskes Of the peculiar rosy or
purple tint of cobalt salts, while the extraordinary
nas is of another tint, perhaps that Of the other
bOoles preseu the sats being examined by r. fl cted
light. There hvestg gatODs Of the highest interest
TO scientific D, they involve the question Of CON-