From the Urey-Miller (now discredited) experiment to demonstrate how life could be spontaneously produced from non living material.
An investigation into theories of abiogenesis. The theory of evolution by natural selection was not involved.
And from Pastuer who demonstrated that spontaneous generation of life, though the prevailing assumption of Darwinists, was not responsible for organisms in his sterilized flask.
Can you cite an evolutionary biologist or 'Darwinist' who ever claimed that microbial life was spontaneously generated? Doesn't sound like evolutionary thinking to me.
And from biochemist Klaus Dose who wrote that thirty years of research into the origin of life has led to:
"a better perception of the immensity of the problem of the origin of life on Earth rather than to its solution. At present all discussions on principal theories and experiments in the field either end in stalemate or in a confession of ignorance."
- "The Origin of Life: More Questions than Answers" Interdisciplinary Science Review 13 (1998) 348, quoted in Lee Stobel, The Case for Faith,Zondervan 2000, pg. 107
That doesn't say that he ever thought that evolution first kicked off life. He's just saying that it is a difficult problem to work out the processes that did start life.
It is my objective opinion from observation over a little more than 50 years, that Evolutionary theorists have distanced themselves more and more from origin of life issues. There was a time when the two topics were very much related.
My opinion is that it is a bit of historical revisionism to suggest that Evolutionists NEVER suggested any connection between spontaneous generation of life and the evolutionary process.
I can't see how anyone with a reasonable knowledge of evolution could suggest such a connection. Evolution by Natural Selection requires self-replicating structures. It will not work until they exist. Therefore how they came into existance is outside the scope of the theory.
Of course you can argue that 'self replicating structures' are not life. However, Evolution by Natural Selection does work once they exist and there is no theoretical problem why they should not then evolve into something that all would agree was life. However, I think you are saying that evolutionists used to say that Darwin's theory also described how the salf replicating structures came about.
I'm sure I asked for a reference to or quote of an evolutionist who said the first self replicators came into existence through evolution by natural selection the last time this came up and I'm equally sure I never saw an answer.
To be fair Origin of Species by Charles Darwin does make reference to the Creator. However it would be naive to suggest that many who believed his theory did not attempt spread the scope of the Evolutionary process over the emergence of life on earth.
Well it doesn't take much thought to realise that before one of the primary requirements was met, evolution by natural selection simply would not work so although they may have considered it, I doubt they would have done so for very long and I think you will have a hard time finding a quote.
Here is where Darwin, I admit, refers to a Creator of life:
"On the ordinary view of the independent creation of each being, we can only say that so it is; --- that it has pleased the Creator to construct all the animals and plants in each great class on a uniform plan; but this is not a scientific explanation." C. Darwin, On the Origin of Species, 1859, 6th Edition, 1910, Vol. II, pg. 233)
An interestting quote. If you read the surounding context, He's talking here about the way that similar basic structures have been adapted for different purposes in different animals, for example the forleg and front foot also being used as a wing (in birds and bats), a fin (in other birds such as penguins, and in aquatic mammals such as whales) and as an arm and hand (in the great apes including us).
As an aside, none of this discussion affects the basic theory and its scope, even if there was a period when it was thought to cover abiogenesis. If a theory is wrong or does not cover all the scenarios it is thought to cover, the scientific method, peer review and skeptical enquiry should expose its weaknesses, as happened with Newton's 'laws' of motion. This normally happens when somebody comes up with a more robust theory that that explains all that the original theory did and more.
--- Penguin.