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Home > Category Index for Science Quotations > Category Index F > Category: Foetus

Foetus Quotes (5 quotes)

Although it be a known thing subscribed by all, that the foetus assumes its origin and birth from the male and female, and consequently that the egge is produced by the cock and henne, and the chicken out of the egge, yet neither the schools of physicians nor Aristotle’s discerning brain have disclosed the manner how the cock and its seed doth mint and coin the chicken out of the egge.
As quoted in John Arthur Thomson, The Science of Life: An Outline of the History of Biology and Its Recent Advances (1899), 126.
Science quotes on:  |  Aristotle (163)  |  Birth (93)  |  Brain (213)  |  Chicken (7)  |  Cock (4)  |  Coin (12)  |  Discerning (7)  |  Disclose (12)  |  Egg (45)  |  Female (24)  |  Hen (7)  |  Male (26)  |  Manner (57)  |  Mint (4)  |  Origin Of Life (35)  |  Physician (243)  |  Produce (102)  |  School (119)  |  Seed (63)

During its development the animal passes through all stages of the animal kingdom. The foetus is a representation of all animal classes in time.
In Lorenz Oken, trans. by Alfred Tulk, Elements of Physiophilosophy (1847), 491.
Science quotes on:  |  Animal (359)  |  Animal Kingdom (9)  |  Class (84)  |  Development (289)  |  Representation (36)  |  Stage (55)

Man has two conditions of existence in the body. Hardly two creatures can be less alike than an infant and a man. The whole fetal state is a preparation for birth ... The human brain, in its earlier stage, resembles that of a fish: as it is developed, it resembles more the cerebral mass of a reptile; in its increase, it is like that of a bird, and slowly, and only after birth, does it assume the proper form and consistence of the human encephalon.
Attributed.
Science quotes on:  |  Bird (120)  |  Brain (213)  |  Fish (95)  |  Man (373)  |  Reptile (26)

We may now give the following more precise expression to our chief law of biogeny:— The evolution of the foetus (or ontogenesis) is a condensed and abbreviated recapitulation of the evolution of the stem (or phylogenesis); and this recapitulation is the more complete in proportion as the original development (or palingenesis) is preserved by a constant heredity; on the other hand, it becomes less complete in proportion as a varying adaptation to new conditions increases the disturbing factors in the development (or cenogenesis).
The Evolution of Man. Translated from the 5th edition of Anthropogenie by Joseph McCabe (1910), 8.
Science quotes on:  |  Evolution (535)  |  Phylogeny (6)

We, however, maintain … that all animals whatsoever, even the viviparous, and man himself not excepted, are produced from ova; that the first conception, from which the foetus proceeds in all, is an ovum of one description or another, as well as the seeds of all kinds of plants.
As translated by Robert Willis in The Works of William Harvey (1847), Vol. 7, 170. Harvey’s doctrine, given herein, has been summarized in later literature as: omne vivum ex ovo omnia, (all life from an egg). Also see the quote “Ex ova omnia,” elsewhere on this webpage.
Science quotes on:  |  Animal (359)  |  Conception (92)  |  Egg (45)  |  Man (373)  |  Plant (200)  |  Proceed (42)  |  Produce (102)  |  Seed (63)  |  Viviparous (2)


Carl Sagan Thumbnail In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion. (1987) -- Carl Sagan
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