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Updated: May 9, 2025
From all this reasoning I would conclude, that though the imagination of the female may be supposed to affect the embryon by producing a difference in its early nutriment; yet that no such power can affect it after it has obtained a placenta, and other organs; which may select or change the food, which is presented to it either in the liquor amnii, or in the milk.
=Characteristics of the fruit.= The fruit of the original species from which our cultivated tomatoes have developed was doubtless a comparatively small two to many-celled berry, with comparatively dry central placenta and thin walls. In some species the cells were indicated by distinct sutures, forming a rough or corrugated fruit.
Experimenting and experimenting endlessly, taking a forward step only when compelled by necessity, this is the way of Nature, experimenting with eyes, with ears, with teeth, with limbs, with feet, with toes, with wings, with bladders and lungs, with scales and armors, hitting upon the backbone only after long trials with other forms, hitting upon the movable eye only after long ages of other eyes, hitting on the mammal only after long ages of egg-laying vertebrates, hitting on the placenta only recently, experimenting all around the circle, discarding and inventing, taking ages to perfect the nervous system, ages and ages to develop the centralized ganglia, the brain.
The phylogeny of the placenta has become more intelligible from the fact that we have found a number of transitional forms of it. The four great legions of the Placentals Rodents, Ungulates, Carnassia, and Primates are sharply separated to-day by important features of organisation.
Its skin is red and covered by a delicate down; the lower jaw has grown to the same length as the upper one. The convolutions of the brain structure also appear during this month. During gestation the unborn infant has been supplied with air and nourishment by the mother. An organ called the Placenta, a spongy growth of blood vessels, develops on the inner point of the womb.
During lifetime the connection between men and their placentas is never withdrawn." The Khasis, although they cannot explain the meaning of the presence of the placenta at the naming ceremony, and the care with which they remove it and hang it up in a tree, are probably really actuated by the same sentiments as the inhabitants of the Southern Moluccas, i.e. they believe that there is, as Dr.
The developing embryo at the end of the suspensor grows out to a varying extent into the forming endosperm, from which by surface absorption it derives good material for growth; at the same time the suspensor plays a direct part as a carrier of nutrition, and may even develop, where perhaps no endosperm is formed, special absorptive "suspensor roots" which invest the developing embryo, or pass out into the body and coats of the ovule, or even into the placenta.
Again it is difficult, it might be said impossible, to believe that an accidental mutation gave rise to corpora lutea the secretion of which caused uterine gestation and ultimately the formation of the placenta.
And finally, that the most essential parts of the system, as the brain for the purpose of distributing the power of life, and the placenta for the purpose of oxygenating the blood, and the additional absorbent vessels for the purpose of acquiring aliment, are first formed by the irritations above mentioned, and by the pleasurable sensations attending those irritations, and by the exertions in consequence of painful sensations, similar to those of hunger and suffocation.
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