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Extracts of uterus, placenta, or ovary produced no growth, although the ovaries used were taken from rabbits in the middle of pregnancy.
This skin is that which is most commonly called the secundine, as it is thick and white garnished with many small veins and arteries, ending in the placenta before named, being very light and slippery. Its use is, not only to cover the child round about, but also to receive, and safely bind up the roots of the veins and arteries or navel vessels before described.
Insignificant as it is at first, however, the region of implantation later becomes very prominent, for it undergoes a transformation that the rest of the mucous membrane does not share. That is to say, it becomes the point of attachment of the Placenta, an organ that has the very important function of drawing upon the resources of the mother's blood.
The body he leaves behind is but the placenta by which he drew his nourishment from his mother Earth. And as the child-bed is watched on earth with anxious expectancy, so the couch of the dying, as we call them, may be surrounded by the birth-watchers of the other world, waiting like anxious servants to open the door to which this world is but the wind-blown porch. Extremes meet.
The women carry the swords for the purpose of frightening the evil spirits, otherwise the latter might get hold of the placenta and make the child sick. Mr.
The villi of the chorion push their branches into the blood-filled tissues of the coat of the uterus, and the vessels of each loop together so intimately that it is no longer possible to separate the foetal from the maternal placenta; they form henceforth a compact and apparently simple placenta.
Usually, but not invariably, the large and pithy placenta is correlated with large-sized fruit having many cells; where this is the case it practically necessitates the cutting away and wasting of a large proportion of the fruit in preparing it for canning, so that the canners usually prefer round, medium-sized fruits.
The curious structure of the cavities or lacunæ of the placenta, demonstrated by Mr. J. Hunter, explain this circumstance.
It is then clear that the Marsupials viviparous Mammals without placenta are a necessary transition from the oviparous Monotremes to the higher Placentals with chorion-villi. In this sense the Marsupial class certainly contains some of man's ancestors.
The necessity of this action explains the contractions which continue even after the placenta has been expelled, when they are vigorous enough to cause discomfort they are spoken of as "after-pains." After-pains seldom follow the birth of the first child, but they regularly follow later confinements.
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