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Updated: September 20, 2025
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.
Nightjars, noise made by some male, with their wings; elongated feathers in. Nilghau, sexual differences of colour in the. Nilsson, Prof., on the resemblance of stone arrow-heads from various places; on the development of the horns of the reindeer. Nipples, absence of, in Monotremata. Nitsche, Dr., ear of foetal orang. Nitzsch, C.L., on the down of birds. Noctuae, brightly-coloured beneath.
No wonder, then, that ever gathering volume from the mere transit over the wildest watery spaces, the outblown rumors of the White Whale did in the end incorporate with themselves all manner of morbid hints, and half-formed foetal suggestions of supernatural agencies, which eventually invested Moby Dick with new terrors unborrowed from anything that visibly appears.
Always from the lower to the higher, from the simple to the more complex, and always slowly, gently. Life has had its foetal stage, its stage of infancy, and childhood, and maturity, and will doubtless have its old age.
No fishes of the present day, in a mature state, are so characterized; but some, at a certain stage of their existence, have such peculiarities. It occurred to a geologist to inquire if the fish which existed before the Old Red Sandstone had any peculiarities assimilating them to the foetal condition of existing fish, and particularly if they were small.
In another class of adaptations the embryonic or larval stage is adapted to new conditions, while the adult condition is either less changed or not changed at all. One of the most obvious examples of this is the allantois in the Amniota. The embryos of Reptiles, Birds, and Mammals all develop two embryonic or foetal membranes, the amnion and the allantois.
These structures are parts which are apparently functionless and useless where they occur, but which represent similar parts of large size and functional importance in other animals. Examples of such "rudimentary structures" are the foetal teeth of whales, and of the front part of the jaw of ruminating quadrupeds.
Old Red Sandstone Foetal: 1st month, that of an avertebrated animal; Carboniferous formation Foetal: 2nd month, that of a fish; New Red Sandstone Foetal: 3rd month, that of a turtle; New Red Sandstone Foetal: 4th month, that of a bird; Oolite Cretaceous formation Lower Eocene Lower Eocene Lower Eocene Foetal: 5th month, that of a rodent; Lower Eocene Foetal: 6th month, that of a ruminant;
At one of the last stages of his foetal career, he exhibits an intermaxillary bone, which is characteristic of the perfect ape; this is suppressed, and he may then be said to take leave of the simial type, and become a true human creature.
But in this case the sucking stimulus has been applied to the glands after a very short gestation, while the hormone from the foetus is being absorbed in the pouch, and therefore the hereditary correlation between secretion and absence of foetal hormone may be assumed to have been lost in the course of evolution. We have next to consider the question of the evolution of the corpora lutea.
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