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The life history, in brief, is as follows: Each adult is capable of producing an immense number of eggs which are carried down the bile ducts with the bile to the intestine, and are passed off with the faeces. Under favorable conditions for incubation, such as warm, moist surroundings, the ova or eggs hatch and the ciliated embryos become freed.
The little transparent embryos from which they arise, oval in form, with a slight, scarcely perceptible depression at one end, resemble the embryos of Coryne already described.
So M. Flourens, who believes that embryos are formed "tout d'un coup," naturally finds no difficulty in conceiving that species came into existence in the same way. End of Criticisms on "The Origin of Species". Waterhouse Hawkins from specimens in the Museum of the Royal College of Surgeons.
Empedocles, that the first of all animals were trees, and they sprang from the earth before the sun in its motion enriched the world, and before day and night were distinguished; but by the harmony which is in their constitution they partake of a masculine and feminine nature; and they increase by that heat which is exalted out of the earth, so that they are parts belonging to it, as embryos in the womb are parts of the womb.
He cautiously remarks, however, that "the embryos and larvæ observed by me in the egg-parasites open up a new and wide field for a whole series of such considerations; but I will suppress them, since I am firmly convinced that a theory, which I build up to-day, can easily be destroyed with some few facts which I learn to-morrow.
I have never, of course, alluded in print to my having independently worked out this view. Hardly any point gave me so much satisfaction when I was at work on the 'Origin, as the explanation of the wide difference in many classes between the embryo and the adult animal, and of the close resemblance of the embryos within the same class.
The skin of the pouch while the embryos are in it is very soft, congested, and glandular; at the same time the embryos when transferred to the pouch at parturition are very small, immature, and have a soft delicate skin. The relation of embryos to pouch in Dasyurus, therefore, is closely similar to that of embryos to uterus after the first few days of pregnancy in the Eutheria.
We come up unconsciously, and go down unconsciously; and we rarely see either birth or death. We see people, as consciousness, between the two extremes. Reproduction Thinking almost Identically The ova, spermatozoa and embryos not only of all human races but of all things that live, whether animal or vegetable, think little, but that little almost identically on every subject.
He will feel that the actions, and the relation of one action to another which he observes in embryos is such as is never seen except in association with and as a consequence of will and memory. He will therefore say that it is due to will and memory.
The vermiform larvæ of moths, flies, beetles, &c., resemble each other much more closely than do the mature insects; but in the case of larvæ, the embryos are active, and have been adapted for special lines of life.
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