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Updated: June 8, 2025
It predicts, however, the afflux that will be necessary at a future pregnancy, in precisely the same way as the growth of the lungs in the foetus predicts the future necessity for respiration, or the formation of ovules in the ovaries of the newborn girl, predicts the future necessity of a reproductive apparatus.
But what seemed the most conclusive proof of all was the fact that in the foetus there existed a demonstrable opening between the two ventricles, and yet this is closed in the fully developed heart. Why should Nature, if she intended that blood should pass between the two cavities, choose to close this opening and substitute microscopic openings in place of it?
Medical science and practice at the present day although it can scarcely be said that it speaks with an absolutely unanimous voice on the whole occupies a position midway between that of the classic lawyers and that of the later Christian ecclesiastics. It is, on the whole, in favor of sacrificing the foetus whenever the interests of the mother demand such a sacrifice.
These observations premised, we maintain that the blood of the embryo, conveyed by the umbilical arteries to the placenta or uterine carunculae transports to the foetus not only nutritious juice, but also a portion of the nitro-aerial particles: so that the blood of the infant seems to be impregnated with nitro-aerial particles by its circulation through the umbilical vessels in the same manner as in the pulmonary vessels.
Ibid., II, 265. Ibid., III, 442. Ibid., III, 442-452. Ibid., I, 50. Ibid., I, 14. Walter Needham, Disquisitio anatomica de formato foetu, London, 1667. John Mayow, "De Respiratione foetus in utero et ovo," in Tractatus Quinque Medico-Physici, Oxonii, 1674, p. 311. Ibid., pp. 319-320. Robert Boyle, The Works, London, 1772, I, 548-549. Browne, op. cit., II, 261. Robert Boyle as an Amateur Physician
Great care must be exercised, as a slight cooling of the air may result in the death of the babe. Abortions are either accidental, criminal, or justifiable, that is, brought on to preserve the life of the mother. Accidental abortions may follow a sudden fall or a sudden shock, either mental or physical, to the mother. They may be due to some disease either of the mother or of the foetus.
'My purpose', says Fabricius, 'is to treat of the formation of the foetus in every animal, setting out from that which proceeds from the egg: for this ought to take precedence of all other discussion of the subject, both because it is not difficult to make out Aristotle's view of the matter, and because his treatise on the Formation of the Foetus from the egg is by far the fullest, and the subject is by much the most extensive and difficult.
In connection with this, we also recalled the mediæval controversy about the moment of time at which the soul is really lodged in the foetus, since the concept of murder becomes admissible only from that point on. Doubtless you also know the gruesome poem by Lenau, which puts infanticide and the prevention of children on the same plane."
Pons was an abnormal birth; the child of parents well stricken in years, he bore the stigma of his untimely genesis; his cadaverous complexion might have been contracted in the flask of spirit-of-wine in which science preserves some extraordinary foetus.
From the presence of the woolly hair or lanugo on the human foetus, and of rudimentary hairs scattered over the body during maturity, we may infer that man is descended from some animal which was born hairy and remained so during life.
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