New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1850-08-30

il a proper plant individual, and that those COO
s'iiuipF tree are ss distinct aud Independent a.
the several Polyps Of q compound ZOO phyte; ADD
that the tree therefore is as much componod
group Of individuals as the Zeophyte. la some
case the plsut forms bat single leaf bud: In ot1
ers ~here there il successive gemmetlon Tor pc
Rod, the number ia gradually multiplied, and more
or ltss, according TO the habit OF the species 80
among Polyps, there is the simple compound
TubulAria, Csmpsuu arts ami the Ike
After TIE plant has sufficiently INSURED by the
production and ero~tb Of ia 90 nber Of lie at.buds
there 10 new developments hbTer bad con
sistpg OF be same elenents 50 the leaf oud, ous
wholly unlike il In general appears zoe, Is ma
90 as the Medasa is unlike the POiyP Tns nl"9r'
individual starts as n bulb from the lea indr'l1u
a. or the group Of 10 # individuals and Is anessou'
in every respect 10 the bulbs from ,ne Osmpanu
lsire and allied species snd 1hen It mas iliy nis
tured il PRODUCES like the Ne6asa 0Sues OF sselA
these seeds to begin az ain the round Of success
i've OF alternating developments. ,,.,;
Thus snong plaLts the seed produce lea mol
vidn,Is there yied bulbs or bods becoming How
erjnaividuals; and these produce seeds precisely
A the EGG produces Poyps, the Polyps bulbs, ira
develop into Meduss and the hedoss, eggs
when we follow out ths subject minuteiy, we
find the analogy completely sasta'ned even Ia
minor points OF structure and growth. Toe ZEAL
bud consists Of leaves developed Ia aspral order,
and in the Poyp as some SPECIES show beyond
Doubt. the tentaces and corresponding parts are
sujrAl in DEVELOPMENT. The same spiral character
is found In the flower, bat the vo.uiio1s are so
close az not 70 be neuished readily from CIR
cles In the hedus9 referred to, the regularly
circular form il far more neatly and pedecIy de-
veloped than amoIg Polyps as Is clearly seen IN
comparison Of the Poyp Coryna, with the elegant
Parsis the related Meduss, species OF which 10
described and beautifully deiueated In Proi. Agss-
sz's recent memoir published by the American
Academy OF Science at Boston The relations Ia
tlvn nfohf
further dwell upon, but;s unnecessary Ia tns place
/ as | have treated upon 1t, at some iens'n 1" my
1 volume OIL Zoophytes. ,...0. >,
The only poiEt in WHICH the AnAiosy seems y
,i1 IL tbst the Medusa bud falls OIL before ITO
/ All deveIopment while this is not 50 with pla1ts.
II il obvious that this is unmPOrtsnt IN Il bearing
on this subject Il is consequence OF the and
dfftren in the mode Of mutation IN the tTo
kingdoms Of nature for he plant-bod GA sePra
ton loses is Only means Of nusriment.
The Law Of Alternating generation ls toereicrs
10 limited principle, arrange aud anomalous aP'
plyipg only 10 q few Rsdsta 1t embraces ua1er
It's SCOPE the Vegetable Kingdom, AMI it Is but
another instance Of identity Ia the laws oil grown
in the two great departments OF life.
COAST sURvEY-TIoyEs, IN TIE GULF OF
An elaborate paper by Prof d. BAcHE Super
interdent Of The U. s Coast Survey, was unaVol1s'
bly, omitted, beyond briefstatement OF the reiuIH
oEtsiped at one OF the section meetings toward
the close Of the session, on account n the great
press Of business and the limited period then LET.
for its accomplishment. L aunex an abstract OF
these esuts az observed at Cat Island Ia the Gat
of Mexico, under the personal superintendent OF
Prof Bache.
Coast Surues al Cat Island IN the Gafot
Mezfco, by A ID. BAcHE, Superintendent.
The tides OF the Gulfof Mexico, said Prof. Bache,
present interesting peculiarisies. They are gen
orally lot universally single day tides Those at
Cat 1sland are the type OF this class The discus.
sioDs applicable to them, reduced 70 rule, would
sDsw er for all others Of the class The progress oil
such q discussion he proposed to present. The
tides at the entrance to Mobile Bay were in part
reduced and new observations making there aud at
other points in the Gulf. By the kindness OF Col
Akert, Major Bache, Lieut. Maury and others, &C
cess had been given 20 observations on record by
officers ofthe Army and Navy. The Coast Sarvey
| would necessarily In its progress afford obssrva'
tons for the complete discussion OF the tides OF the
Gulf Of Mexico. The Superintendent gave no.
tice oftbe place. means and manner OF observation,
| Of the persons by whom they were made and dis
| cussed. The observations were made hourly day
and night for year and very faithfully, by Messrs.
WufdemsBn and Bsseett, under direction OF q. j.
Patterson OF the Navy The average rise and fall
is but one foot. There ia one high and one low wa
ter as q rule in the twenty -four hours. Tho wind
is supposed by navigators generally 20 cause these
tides but the hypothesis, when carefully examin-
ed, falls to the ground.
Such tides bad been observed elsewhere. A
brief narration Of the explanations OF Newton.
| notice Of the researches OF Mr Whewel and Of Mr.
Airy followed. The reductions both 10 tables and
diagrams, were explained
The time Of high water advances as the lunar day
gains on the sosr. until suddenly 1t shifts nine, ten
and twelve hours. The Low waters follow thesame
law. TIE times ofchsnge are at or near the period
when the moon crOsses the equator. This points
to the oiurnalinequality, u shown by MIR. WheEell,
~ the source Of the phenomenon
An establishment useful 20 the nsvigators may
be obtained BY considering the iuni tidal intervals
for the superior and inferior ransts according 70 the
moons place, north or south Of the equator. Ofdi-
nary modes of discussion fail entirely.
The curves of hourly observsticns for the year
leave no doubt that TIE declnatlOn changes OF the
moon are those first to be looked to Ordinary
double or ak hour tides occurred always a. and
near the period Of no decliuasion, when they were
near the quadrntures The tables for the whole
year showed this and the comp arson Of tides at
The zero and maxim m Of decinsEon showed that
the time Of occurrence (epoch) corresPonded very
nearly, at a can, with the moons position
The explanation Of the tides was to be found in
the Interference OF the semi-diruna and Of the
oiuTntl tide waves.
Prof Bache examined abe int ference Of q mean
semidiurnAl and Of mean diarna curve, approx
imately deducsd from these observations, aud
showed that q coincidence OF hish waters, q diff
ference Of three aud Of six hours would not agree
with the observ atons, END that difference OF nine
hours Represents it either exactly or nearly So he
traced the variations in form OF the desred curve
corresponding to different dechns ions OF the moon,
and 70 herent phases, and sho we'd their general
agree ment with observation. HI gave the form of
equation as modified from Ar. Wheweli and
simple result Of easy tsbulation for the greatest
ordinate
Prof Bache showed how the curve Of observation
could De decomposed into two Others and the plan
| followed Tor thus tabulsting the observed numbers
Ia regard to hight. The curves thus afforded were
/ est2d by theory and gave results which were &C.
| col dent within very small quantities The great.
est difference OF the mean OF three mon tbs obscrvs