The Davenport gazette., 1854-08-17
The Process Of Incubation.

From the kura! New Yorker We extract
the following;
The process OF the incubation Of the
chicken in the natural way, is a subject GU
rious and interesting. The hen has scarce
" e, on the egg twelve hours before some
lineaments OF the chicken begin TO appear
The heart may be seen TO beat at the second
day: il has ut that time somewhat the form
OF a horse shoe, but no blood yet appears.
At the end Of .wo days, two vesicles OF
blood are to be extngushed, the pulsation
Of which is very visible; one of them is the
len yentrcle and the other the great art
terry. At the fiitieth hour the auricle Of
the heart appears, resembling a moose fold
ed down upon itself The beating of the
heart is first observed in the auriele, and
then in the ven,ricle. Al the end Of sew
enty hours the wings are distingushable;
and on the head two bubbles are seen, for
the brain one for the bill, and two more for
the fore and hind part ofthe head. Toward
the end OF the fourth day, the two aufeles
already visible, draw nearer to the heart
than before. The liver appears towards
the fifth day. At the end al one hundred
and thirty zone hours, the first voluntary
motion is observed At the end OF seven
hours more of the lungs and stomach become
visible and four hours alter this, the intes-
tines, the loins, and the upper jaw. At the
hundred and forty fourth hour iwo rentri-
cies are visible, and two drops Of blood in
stead of the singh. one which @as seen be-
fore The seventh day the brain begins
to have some consistency. Al the hun
dred and ninetieth hour o. incubation the
bill opens, and the flesh appears on the
brpastf in four hours more the breast-bonc
is seem and in six hours after this the ribs
appear forming from the back, and the bill
is very visible, as well as the gall bladder.
The bill becomes green al the end OF two
hundred and thirtysix hours; and 1.-THE chick
en- be taken out Of its covering, il evidently
moves itself The feathers begins 10 shoot
out toward the two hundred and foriieth
hour, and the skutl becomes gritty. At the
two hundred and sixty fourth hour the eyes
appear. At the two hundred and eighty
eighth hour the ribs are perfect. AT the
three hundred and ihirty-frst the spleen
draws over the stomach AMI lungs TO the
chest. At the tEI e ...L..ec nutlaa I and fl
tv five hours the bill frequently opens and
shuts; and at the end OF the eighteenth day
the first cry ofthe chickeni Is heard. l'after
ward gets mere strength and grows contin-
uailv. till il Is enabled to set I.selt free from
confinement.
I In the whole OF this process We must re-
4 mark that every part appears exactly at IT.
proper time; il, for example, the liver y
formed on the fifth day, il is founded on the
preceding situation Of the chicken, and on
/ the changes that were to follow. No par
Of the body could possibly appear sooner OF
later, without the whole embryo suffering
I and each limb becomes visible at the tit mo
ment. How astonishing must it appear L
an observing mind, that in the substance @
the egg there should be all the vital princi
I pie Of an animated being. that all the part;
of an animals body should BE- concealed ir
il, and require nothing but heat TO unfold
i and quicken them. that the whole torma
ton Of chicken should be SO consian, and
regular; that exactly at the same time the
same changes will take place in the genera
+ ity of eggs and that the chicken the mo-
men, it is hatched is heavier than the egg
was before,