New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1873-04-05

4 C D

nhed. Mesob or contents Of Park ps,s vecle nguifel
Contents Of PurkneIn yedele.l
Suppose should represent ovarian egg Of the hen
enlarged that the germinative vesce alone would a
pear large a whole ovarian egg at the time OF ma
turity; we should find that the whole OF the yek
siss either little granules in little vescles resem
bling each other much as almost TO force us to the
conclusion that these yesicles arc only granules
aeh s 5sVe 7"0 these al" smaller vesieies are
others somewhat larger, containing themselves
character of ordinary cells The whole OF the yOk
consists OF such granular yesices and true ces Inc
yOk is IN fact accumulation Of cells In various stages
Of growth This large yOlk this large ovarian egg OF
ben, with its contents was itself at one time so small as
place a portion Of the ovary Of the hen under the
microscope and have at the same time in the
the natural eye other eggs perceptble in different
degrees and we find that the smallest are Just Ike the
granules floating in it, while others contain cells already
TO distinguished and others are full OF cells so large
az TO make the whole mass Opaque The peculiar color
of hens is owing 10 the yelowlsh OIL which per-
vades the whole substance. think that the study OF
the hens egg in all its stages leaves doubt that the
celsat least those within the egR-are formed by the
swelling of these yelk particles and their subsequent
the elements OF perfect cell finally matured We
certainly justified in saying that they are cells and
fom the enlargement of solid granales these granues
animal particles secreted BY the organs in which
Al this stage OF the ovarian egg that is when has
acquired the vtelliDe membrane, germinatiye yescle
and germnatve dot also acquired certain dimensions
differing In different animals 1t H. may be- formulated
This formulation consists Ia the contact OF sperm cells
with the yOk bag What the influence Of that contact is
nobody has been able Cfhe way In which the
spermac particles reach and penetrate the egg we shall
consider heresfter) II Is from That time that the
changes date which lead toward the formation OF ne
being But the egg OF the hen when formulated has lot
yet completed its growth The hens egg. IA we know IT,
has 4 shell, and delicate membrane lining the shell,
aud layer OF white albumeD surrounding the yOlk All
parts formed after the egg has been
SPECIFIC DIFFERENCES OF DEVELOPMENT IN EGGS.
80 you zee that the life OF the in this class OF animals
Is something Independent as II were, within certain
limits from the growth Of these essential portions Of the
egg which lead to the formation OF the being Why
it Is that the egg must be laid in that condition
I'm order to lead directly TO the growth OF the
Young; why il is that In the bird the lies dormant
In the egg after the egg has been laid, until certain
Temperature is applied 10 It, cannot explain but those
are conditions which always accompany the formation
of the germ In birds, aud It's final development into
new being. In msmmalla-to show you how great
contrast exists between these two casses-the ovarian
egg rs not dropped when the germ begins It's growth
INF IA retained until the germ has acquired certain
dmenaOns certain stage OF develOpment, which varies
No TO species. Every knows that our opp0s
sum brings forth young 80 delicate ana 80 nperfectly
developed that they require protection from the mother
long after birth They become attached 10 the teats OF
the female and hang there for number OF weeks before
they are capable OF shifting for themselves Other am
mails are born already covered with har but are bnd,
as ia tho case OF cats wnlo others are born 30 lhat
tb0y capable Of walking away ~ 0nco W " the eSSe