Ed: I greatly appreciate you comment that my post attracted your attention. All we humans are so vanity prone and I'm no exception.
Now to your further paragraphs.
The philosophical justification of biological evolution - should it be needed at all for reasons that are arcane, at least to me - has been provided by Ayn Rand herself. In "Philosophy: Who needs it", she stated that "Philosophy studies the fundamental nature of existence, of man, and of man's relationship to existence… In the realm of cognition, the special sciences are the trees," adding that "philosophy is the soil which makes the forest possible." Further on she deduced ("For the New Intellectual") that "Science was born as a result and consequence of philosophy (my emphasis)… It is philosophy that defines and establishes the epistemological criteria to guide human knowledge in general and specific sciences in particular (again my emphasis)."
Now, evolution (nowadays more often called "synthetic theory of evolution" because it incorporates all additional knowledge provided by geology, paleontology, cosmology, chemistry, etc.) is one of the special sciences to which Rand refers. I consider that this suffices to firmly establish Darwin's scientific theory on the basis of philosophy as Rand defined.
Now, why is it a "scientific theory"? I'll go into this along the following paragraph.
On you request for "proof of truth" (truth value) for evolution. Ed, I fear that you are falling prey to the Creationists and further religionists conspiracy. If you look it up in the Internet, you will see that it's filled by these people's request for such "proof of truth". There are practically thousands of such claims for "truth", quite apart from their endless insistence that Darwin's theory of evolution is not even a theory but merely a hypothesis. They don't even read the term "theory" correctly. In German we prefer to speak of "Darwins Evolutionslehre" (Darwin's teachings on evolution) to oppose it to the Creationist's love to point out that it is just a "theory" (i.e. a hunch, a guess, in the common use of the term). But Darwin's theory of evolution - this too they purposefully love to forget - is a scientific theory which, as Nick Gisburne correctly informs, bears no relation at all with the common use of the term, since a scientific theory is, in the simplest way of using the term, an explanation of the facts. Hence, Einstein's theory of relativity, for example, explains Newton's laws. And this explanation of the facts constitutes in itself the "proof of truth" Creationists constantly request. Ah, but they can't accept it because they are unwilling to do so.
This constant - and useless - insistence on "truth" (facts are truths in themselves, let's not forget this) comes from people who carefully avoid even to talk of the need to provide by themselves a proof for the existence of what they call "god" (whatever they may mean by it) because they know perfectly well that the existence of something that doesn't exist cannot be proved, as I clearly demonstrate in my book "Ayn Rand, I and the Universe". So what "proof of truth" is requested? Cosmological records? Geological records? Paleontological records? Biological records? All of them are true and make up Darwin's teachings on evolution, but Creationists and the rest of the bunch will never ever accept anything of the sort because to accept just any of it would shatter their beliefs to pieces, though not for non-believers (atheists know the truth since a very long time ago indeed) but for themselves, a fact they dread to face for it would mean that their world of fantasy (and all the money they get from it) has come to an end (it did so from the very beginning, though they resist having to recognize it) and what remains is naked, stark reality.
But then you jump from this universal "law of identity applied to actions" to the human capacity to think, and you just say that thinking's included in man's identity.
And, while I agree with the truth of that, in the context of the argument of evolution, it's considered -- philosophically -- only trivially true. In other words, the fact that man's nature includes thought, doesn't bear positively or negatively on whether or not evolution ought to be accepted as true.
My post is not a detailed account of all the connections existing. For this you may better refer to a good book on evolution and genetics. Now, while for other "philosophies" the human capacity to think may be a "trivial truth" you may well gather from Ayn Rand's writings that it is very main part of man's identity. And in what refers to the truth of evolution, I tackled this a few sentences back.
The absolute-relative brain weight relation is correct as stated in my post, since I also said there that all related conditions, external as well as internal, must correspond. I know, of course, that dolphins (and other big sea-mammals) show a relation similar to the human being's brain (which explains why we are at the threshold of being able to communicate with them) but I didn't consider it important to mention in relation with the rest of my post, precisely because of said external and internal conditions, for dolphins and other such creatures lack these, which are required to effectively reach the operative status: arms and hands, legs to move around and a mainly dry environment allowing the production of fire and the development of mechanics, etc. etc. There are other, additional conditions needed but the ones mentioned are the ones essential for effective operations. Glad to keep on communicating with you.
Claude: I've rarely seen that many tongue-twisters in just one sentence to voice how much you hate what I wrote in post 70. You may just have kindly said that you despise my very existence. However, since you went to no lengths at all to be polite, may I ask you if you love to show around as a linguist gone berserk or merely like to be a prattler?
Further on: So "consciousness is not inherent in matter" (I take it that you mean in this case "human matter")!. Well, where is it then? In a non-existing ethereal dimension? Moreover, the fact that it exists in human matter and can even direct human matter (!!) contradicts most openly your statement that matter determines the behavior of "mind" (understanding this to be a synonym of consciousness - see Rand for more of this).
How can consciousness "expunge the notion of free will" when free will is precisely one of its main operating tools?
Is it an "actual property of atoms"? Did I say so? Not at all. But even atoms have the basis for properties which only come to light at the level of more complex combinations. Were this not so, they could never even be part of any complex combination. With your statement you seem to reject the fact that as "simple" an element as hydrogen can take part (and a major part at that) of any of the aminoacids. As a matter of fact, I'm right now racking my head to make out how can simple hydrogen be even part of so complex a thing as water is, with all its states of gas, solid and so forth…
You seem to be involved in more and more contradictions, Claude, but who cares, right?.
To your further question: Yes, I am a materialist, though not in the common sense as you seem to mean, but in the Objectivist sense: a materialist-spiritualist since Rand abolished the only apparently existing dualism between the two by deducing Objectivism from reality. Spirituality is not an incorporeal state as religious people would have it, but the very material thinking, motivating, feeling and willing part of the human being, i.e. our mind (consciousness, oh boy, oh boy) and the intelligence it sometimes musters (see my various posts in this forum or, else, my book "Ayn Rand, I and the Universe" as published by "Rebirth of Reason").
The way you use the terms "mind" and "consciousness" looks more to be in the religious fashion, i.e. as an ethereal "quality" as "given" by a non-existing entity. Here too I refer you to my writing. Else, may I ask you to answer the question as it was presented by wonderful Mark Twain: "When the body gets drunk, does the spirit remain sober?" It would do, you see, if it were a part separated from man's body but, of course, as Twain's words proved, it isn't.
As I said elsewhere, trying to disvalue splendid Objectivism is just another of those boring attemps that can't affect it in any way whatsoever.
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