The thread seems to have gone off-topic. It doesn't matter what Darwin believed in. Attacking the personal beliefs of a person does not mean you have attacked the person's arguments.
Lets go back to the original post.
It is impossible for a scientist to not be influenced by other scientist's conclusions. Any given physicist would be influenced by Einstein's conclusions about special relativity and general relativity. An individual's scientific knowledge is not gained de novo, but by studying other people's works and building up from there. Similarly, Darwin was influenced by the scientific climate and other people's conclusions that existed at that time. Other people like Lamarck or Darwin's grandfather had suggested evolution, but by differing mechanisms. Darwin was aware of the conclusions of geologists like Lyell (whom he kept up correspondence with) who suggested that the Earth was very old. So it could be easily and correctly said that Darwin's theory was not made up on the spot or purely because of his genius, but partly formed because of the contributions of others.
He did not however start with the conclusion that evolution was a fact. He only came to agree with the 'transmutation of species' after he came back from the Beagle journey:
More from Wikipedia:
I think that is enough to succinctly show that Darwin did not start from a conclusion and worked backwards.
Lets go back to the original post.
It is impossible for a scientist to not be influenced by other scientist's conclusions. Any given physicist would be influenced by Einstein's conclusions about special relativity and general relativity. An individual's scientific knowledge is not gained de novo, but by studying other people's works and building up from there. Similarly, Darwin was influenced by the scientific climate and other people's conclusions that existed at that time. Other people like Lamarck or Darwin's grandfather had suggested evolution, but by differing mechanisms. Darwin was aware of the conclusions of geologists like Lyell (whom he kept up correspondence with) who suggested that the Earth was very old. So it could be easily and correctly said that Darwin's theory was not made up on the spot or purely because of his genius, but partly formed because of the contributions of others.
He did not however start with the conclusion that evolution was a fact. He only came to agree with the 'transmutation of species' after he came back from the Beagle journey:
After he came home in 1836 he began speculating on transmutation (evolution), whilst confirming his reputation as a geologist. It seems fairly clear that his belief in evolution, and invention of the ideas of natural selection, arose at this time and not before or during his voyage. He lived in Gower Street � near to Robert Grant whom he apparently never went to see.
More from Wikipedia:
By mid-March, Darwin was convinced that creatures arriving in the islands had become altered in some way to form new species on the different islands, and investigated transmutation while noting his speculations in his "Red Notebook" which he had begun on the Beagle.
I think that is enough to succinctly show that Darwin did not start from a conclusion and worked backwards.
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