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Updated: June 20, 2025
This is certain, that it is in the head, since the head is the seat where the understanding thinks, and the will intends; and in front in the face of the head are man's five sensories, receiving life from the soul alone which resides in the head; but in what particular part of the head the soul has its more immediate residence, I dare not take upon me to say; yet I agree with those who fix its abode in the three ventricles of the brain, sometimes inclining to the opinion of those who fix it in the corpora striata therein, sometimes to theirs who fix it in the medullary substance of each brain, sometimes to theirs who fix it in the cortical substance, and sometimes to theirs who fix it in the dura mater; for arguments, and those too of weight, have not been wanting in the support of each of these opinions.
The corpora cavernosa of the male and the clitoris of the female being suddenly distended with blood, it is impossible to withdraw either of them until the turgescence of the parts has entirely ceased.
During the whole of this time there are no embryos in the uteri, and therefore it might be urged absorption of hormones from the embryos cannot be the cause of the persistence of corpora lutea in pregnancy. But it seems to me that a complete answer to this objection is supplied by the peculiar relations of the embryos to the pouch in Dasyurus and other Marsupials.
And so with reference to the law of combinations. The old maxim was, Corpora non agunt nisi soluta. If two substances, a and b, are inclosed in a glass vessel, c, we do not expect the glass to change them, unless a or b or the compound a b has the power of dissolving the glass.
When pregnancy does not occur the corpus luteum is formed, but begins to diminish within ten or twelve days in the human species and is then gradually absorbed. According to O'Donoghue, in the Marsupial Dasyurus there seems to be no difference either in the development of the milk glands or of the corpora lutea between the pregnant and the non-pregnant animal. Lin.
The complication of the organ increases; cavities, termed ventricles, are formed, which do not exist in fishes, reptiles, or birds; curiously organized parts, such as the corpora striata, are added; it is now the brain of the mammalia. Its last and final change alone seems wanting, that which shall render it the brain of man." pp. 150-152.
"Nosti quantis turpitudinibus immoderata mea libido corpora nostra addixerat et nulla honestatis vel Dei reverentia in ipsis diebus Dominicæ passionis vel quantarumque solemnitatem ut hujus luti volutabro me revocavit. Sed et te nolentem aut dissuadentem quæ natura infirmior eras, ut sæpius minis ac flagellis ad consensum trahebam.
"Ligures in terra cubant ut plurimum; plures ad cava, saxa speluncasque ab natura factas ubi tegantur corpora divertunt," "The Ligurians mostly lie on the bare ground; many of them lodge in bare Caves and Caverns where they are sheltered from the inclemency of the weather."
The case of Dasyurus, however, seems inconsistent with this argument, for, as previously mentioned, Sandes found that in this Marsupial the corpora lutea persisted during the greater part of the period of lactation, which continues for four months after parturition.
It is to be concluded from this that the cause of secretion of milk is the withdrawal of a stimulus proceeding from ovary or uterus. But O'Donoghue believes that milk is secreted in Dasyurus when no pregnancy has occurred. This shows that the development of the milk glands in rabbits is due to the corpora lutea.
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