New-York tribune., 1867-02-21

| "a
which occupy ne highest position next the monkey
OF an inferior stamp Instc'd OF bears as we nave
teIn even in the Northern ntuent, and everywhere
else upon the globe IRE are badgers ana smaller KINDS
the tropics are represented ony nee aud panther
Iat 4ens the case, you that we nl1 eStSonsn th
, unents, as far as their animal popu 1,son ,noS 70
tt,Id, cothGteT,IHed, Just as IN each continent 'a%{ any
mails as they occupy higher or 10 Ner
position In accordance with the element in which the
higher Significance when examine the mode of
growth OF these animals when we study their formation
III the and their changes there and their transfOma
ton up 10 the time when they have completed their
aed 10 ea e9 nap s e 81 f e are 80
ton Of the higher out Of the lower perfectly
remain satisfied with that explanation Which i, now
prT{aleat among natnlaiist. as IN reality the true
that you may how far the facts go TO support
tbat Idea, will now proceed 20 show you how great is
certain periods OF their growth will proceed to show
you that all ycrtebrates, whether fishes reptiles birds,
quadrupeds excluding man, when they begin their
formation have and the type; that all arise,
Like ell other animals. from eggs, and that the egg
makes drawing on the board Aud that egg is simple
bag in its smasO small that
tho microscope to detect IL. But that egg will grow
larger and as grows larger 1t s noticed that there are
dOls OF condensed matter appearing inside ana one Oh
them may acquire greater prominence than the Other
so mat the egg appears like bag containing nulu IN
which swins another bag. And when that egg mas
grown to still greater dimensions, then that inner bag
have arisen these dimensions llustrdtlng
third bag may be found inside which Is fun Of condensed
matter this itself may be full Of substance which Is
condensed and itself present other indications
OF condensation going on draws an eggl' Now that
would be perfect egg, and yet II may De so slnall
rabbit dog when complete In its FORM is so small that
the human eye cannot see 1t but with the microscope II
Young egg Of hen which forming; and when that egg
has acquired greater dimensions then IL becomes visible
but II does not differ in structure from the egg OF quad
rped as the Of the bird does not Iffer from the egg
OF the reptile the of the reptile does not differ from
the egg OF the fish The principal differences are In the SIZE
which the egg acquires ana IN the substances win Whch
II Is surrounded protection Only that constitutes
properly the which ordinarily call the yok Ihe
principal and essential part OF hens egg Is not the she'll
or the white which within immediately below the she'll
but the yolk alone. And that yolk has grown out OF
bag like that becoming finally 80 bulky and so full OF Tho
substances which We have here IN this egg that
in fact a bulky mass OF yolk, around which is
then formed that mucosity, or that vseous mat
fuence OF heat and becomes white aud around which
formed the shell-lmakes drawingl Now this IL prop
ery the egg. and when that egg small, neither the
white the shell existed, and the yok Itself was very
SMALL at one time was 30 small that 1t was hardly ys
BILE the nakcdeye So that really have eggs fOne and
the structure throughout the type Of the vertebrate
and may add. throughout the animal Kingdom In the
bird the yOk suspended by strings OF albumen which
Yit cann, ,pnys ~ ycept to rotate aTon9d itself Now
from this yok IN fishes In reptiles In birds as well as In
the namuaa, the young IS developed In the same man
; ,;i @ % ,bn ,e s m 80 tha yo annnose we have here
the yOlk alonethere ssures forming the SURFACE Oi
the yolk becomes indoned in this manner ustratingl
and these fissures grow deeper and more numer-
Gus, until the whole surface OF the yolk is
rs 70 were, kueudcd-it is, as it were, cut up
into small pieces and these pieces cut mp again and
again. and that process pcnetrates more or less deeply
in fishes NJ once about onehaf OF the yok Is in that way
kneaded; In reptiles about onchah aso In birds, only
the surface In the mamnaa, the whole egg - cut up ~
that way until reduced to most minute particles aud
then becomes sort uniform layer resting upon the
surface OF the yok Now that layer Is the basis from
which the young dcyelopcd and the iTst step which
takes place in the Of the young upon that
surface OF the yolknOw become for 1t has been so
up that It's particles reduced TO minimum dimen
sionhe first step which takes place Is the formation OF
a deprcssiona sort OF furTow-and that nrrow grows
deeper aud deeper until the two sides OF II rise as
wcre ridge. SO thati make section across the egg
and represent here iusIating the egg So with tnht
furrow H. this would be itS appearance The swelling
of neaded substances Of the surface of the egg upon
sides OF the rrow constitute now al there Is OF
the animal; and yonnS fs, or young bat OF young
dog a young bird young turtle, or young snake,
that stage do not differ from the other exeepsPer
hap- I'm the sile or may De- slightly IN the c0oE, bl
there IA this ono mark between some OF those ami
mails suppose We have here the tprtle'sr GFS nayS
hors % ls te S9ih ~ hany position either so, or 90
no matter And in some species, when opening turtles
egg you may find that tho furrow Of the young IN any
opened thousands Of eggs with the view OF examining
the Growth o the chicken, and its first formation ana
You always find that the first mark oi the young s Ie
urrs,on n the yOk, position which u crossEse 10 tne
long diameter of the egg and now as that goes or n
change takes place; the furrow becomes Dfoauet anu
dreper at one side. Illustrates That side which Is
broader and deeper To be one day the head ana tt
there h not vet any indication Of difference In
substance; We have no S"clrtoh we h'IJ hIoodo 40
flesh; have no akin we nave no ' DioDu'
II IL an uniform substance, very delicate Almost aspd
rent some hat Ike Jelly, but having yet soit OF creamy
wheness about II which Is very peculiar ana g.,
softncss which makes mauipuiatons exceedingly 1hl
r. and In order 90 examine such eggs To advantage
they must be opened under water ana the "Ast nhst
have the same temperature as lhat unuer NhlCn thc
egr "A rowing Aud then 10 must be opened SO that the
parts exposed shall float IN the water anu men you may
take them mp glass and place that glass Under tmo I'M
that the whole this yolk mass OF cellular ussue-a
mss of little cells ot eKaSty, tne -. same rh up up
is not yet any dliior"utc IN tio suOst"nvc.
Rut next thc following difference Will be found ia hs,e
I.s.r and "A
Tho cell. ON the surface here will be smaller thah thoNe
below; thon this ridge will grow higher and higher ana
lea@ Psrn@ra SeeT Together there viii be Of canal
instead OF mere depression ON ine Pag, ana ,i,c @
maton of these two sides and In proportion as tat
Ps ' his edge will grow lower aud lower. and gradu
ny come nearer the lower side, and In the end we shall
,,icr tbc ,rction made the other day OF the yerte
brnte YOU see We have here the first Indication
OF what will be bacibouethe first indication Of What
~ snal vsteInthc cavity for the spinal marrow and
@ cavity for the principal arch OF the body and what Is
the formation OF the lower cavity, when Is now ono cav
y without organs yet; but In course Of time organs are
Jsyeloned within and so the animal IL formed The part
here which consists of the larger cells becomes more so
and the first Indications OF the bones are formed In me
shape Of cartilage herc-soft cells are formed which VIII
be flesh Cells at the surface are formed Nhloh Sphsu
tute In the end the skin, ana IN that substance "ho
NJ first perfectly homogeneous, there are 8raMnu
ally parts soating ana assuming ,o ,Eo,. pSsGmar py.em
Here aud there particles will become fluids ana ana IN
those fluid particles others will roll ana these paiu@Ges @
railing Ina the fund will follow certain track, ana thht
Will become "a channel, which Will be IN the end pioou
Conceive that you had DulldlngNhlcH ~ III 81
was mass suppose that an edlilce of cohsaetHpe
dimensions was now put mp Of Of clay
and that there no difference throughout. ot
that by "A singular process, by singular agitation
within that clay t should work itself aud that here ana
there il should become harder here and there II sn0ud
hccome softer here and there 10 should become holoW
and here aud there particles fall into these hoows, and
i'm these ho0ws accumulate fluids, and tho walls hroul
hccono hard and solid and In other parts there shOu1
he fbrous structure furmng-suppO>e here beam ana
there tube and ali the different elements when constr
tute perfect cdcc should grow out by itself OF unioIh
CLAW 50 that you should have In the end an edce con
sisq OF large stones of beams Of every knd WIN uh'S
m ,,,t h.ye ,,rnyru of itsclf-yOu would