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Organs of extreme perfection and complication. To suppose that the eye, with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could have been formed by natural selection, seems, I freely confess, absurd in the highest possible degree. Yet reason tells me, that if numerous gradations from a perfect and complex eye to one very imperfect and simple, each grade being useful to its possessor, can be shown to exist; if further, the eye does vary ever so slightly, and the variations be inherited, which is certainly the case; and if any variation or modification in the organ be ever useful to an animal under changing conditions of life, then the difficulty of believing that a perfect and complex eye could be formed by natural selection, though insuperable by our imagination, can hardly be considered real. How a nerve comes to be sensitive to light, hardly concerns us more than how life itself first originated; but I may remark that several facts make me suspect that any sensitive nerve may be rendered sensitive to light, and likewise to those coarser vibrations of the air which produce sound.
In looking for the gradations by which an organ in any species has been perfected, we ought to look exclusively to its lineal ancestors; but this is scarcely ever possible, and we are forced in each case to look to species of the same group, that is to the collateral descendants from the same original parent-form, in order to see what gradations are possible, and for the chance of some gradations having been transmitted from the earlier stages of descent, in an unaltered or little altered condition. Amongst existing Vertebrata, we find but a small amount of gradation in the structure of the eye, and from fossil species we can learn nothing on this head. In this great class we should probably have to descend far beneath the lowest known fossiliferous stratum to discover the earlier stages, by which the eye has been perfected.
In the Articulata we can commence a series with an optic nerve merely coated with pigment, and without any other mechanism; and from this low stage, numerous gradations of structure, branching off in two fundamentally different lines, can be shown to exist, until we reach a moderately high stage of perfection. In certain crustaceans, for instance, there is a double cornea, the inner one divided into facets, within each of which there is a lens shaped swelling. In other crustaceans the transparent cones which are coated by pigment, and which properly act only by excluding lateral pencils of light, are convex at their upper ends and must act by convergence; and at their lower ends there seems to be an imperfect vitreous substance. With these facts, here far too briefly and imperfectly given, which show that there is much graduated diversity in the eyes of living crustaceans, and bearing in mind how small the number of living animals is in proportion to those which have become extinct, I can see no very great difficulty (not more than in the case of many other structures) in believing that natural selection has converted the simple apparatus of an optic nerve merely coated with pigment and invested by transparent membrane, into an optical instrument as perfect as is possessed by any member of the great Articulate class.
To suppose that the eye, with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could have been formed by natural selection, seems, I freely confess, absurd in the highest possible degree.
Originally posted by Jerry Smith
It [evolution] has been "proven" - that is evidenced beyond reasonable doubt.
Originally posted by randman
If Camp was so off, then why did the Talkorgins guy write?
"First, I have incorporated new material into the original essay that specifically addresses many of Camp's points, and thus much of his response is now superfluous."
http://www.talkorigins.org/faqs/comdesc/camp.html
Originally posted by randman
Camp is right here. Theobald's assertions on nested heirarcies just hot air, and proves nothing.
"The notion that the nested hierarchy of organisms is incompatible with creation is based, not on science, but on the unprovable theological assumption that if God created life he would do it in some other way.
Originally posted by randman
"Humans and horses, both being placental mammals, are presumed to have shared a common ancestor with each other more recently than they shared a common ancestor with a kangaroo (a marsupial). So the evolutionist would expect the cytochrome c of a human to be more similar to that of a horse than to that of a kangaroo. Yet, the cytochrome c of the human varies in 12 places from that of a horse but only in 10 places from that of a kangaroo. (See matrix in Brand, 134.)
Such discrepancies between traditional phylogenies and those based on cytochrome c are well known. Even Ayala could only bring himself to say that [t]he overall relations agree fairly well with those inferred from the fossil record and other sources (emphasis supplied). (Ayala, 68.) He then acknowledged:
The cytochrome c phylogeny disagrees with the traditional one in several instances, including the following: the chicken appears to be related more closely to the penguin than to ducks and pigeons; the turtle, a reptile, appears to be related more closely to birds than to the rattlesnake, and man and monkeys diverge from the mammals before the marsupial kangaroo separates from the placental mammals. (Ayala, 68.)"
Basically Jerry, I admit to knowing little of genetics and some of this stuff, but Theobald seems full of it in terms of his argument, and Camp is clearer, more direct, and appears more accurate.
I certainly think the 29 evidences is pretty much BS, but I'll grant you that I prefer to stick to simpler stuff like fossils which to me are the hard data.
Originally posted by randman
How can you argue with this?
Dr. Theobald accuses me of constructing a straw man because I said his argument was that the hypothesis of universal common ancestry predicts that all organisms will have one or more traits in common. He claims that this summary phrasing weakens his argument by omitting the fact he specifies that the traits all organisms must have in common relate to the basic functions of life. He then quotes from the original prediction 1 to verify that his claim was more specific. (In saying that he was quoting from the original prediction 1, Dr. Theobald may leave the casual reader with the false impression that those comments were not included in my paper. The fact is that I quoted his alleged prediction in its entirety.)"
http://www.trueorigin.org/ca_ac_01.asp
I read Theobald, and Camp is right here, and more to the point, Theobald appears disingenious in claiming Camp misses the point and does not properly address the issue. Basically, Theobald tries to use sophistry and fails miserably. The fact Camp quoted its entirety pretty much demolishes Theobald's windy mess.
Camp basically devastates Theobald's weak arguments elsewhere as well.
Originally posted by npetreley
Oh yeah, and I love how it's been proven.
Hey, these genes [blueprints] for a chimp look a lot like the genes [blueprints] for a man. Could it be because they're so similar? Nah, it must be because they have a common ancestor. Well, there you have it. Evolution is proven.
And why is the fossil record lacking? "For some reason." (actual quote) Yeah, that's the ticket. "For some reason." God enough for me.
Gosh, well, that's all the proof I need.
I certainly think the 29 evidences is pretty much BS, but I'll grant you that I prefer to stick to simpler stuff like fossils which to me are the hard data.
Originally posted by npetreley
Really? My opinion of witchcraft aside, can you show me the studies that disprove witchcraft?
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