By way of injecting some interest into this thread, it might be worth examing another issue here. There seems to me a flaw in 'Origins' and many the documents that flow from it - and, by a happy coincidence the same flaw is in the Bible - namely, the assumption that the whole concept of a species is valid. I can, and do, accept evolution occurs, and that we, as a sentient life form' can cluster gene-machines and call them goats, or sheep, or whatever, but the older I get the more I feel that the concept of 'species' is a structure we humans impose on the world rather than what is actually there, in the same way we impose seven colours on the light spectrum. In short: the concept of species is digital but I grow more and more convinced it is continuous at a macro level, (in the sense that a liquid or sand is continuous, though composed of discrete particles; I agree that at the DNA level things are digital). I think this issue is exemplified by beetles where the various species can only be distingished by highly trained specialists.