Could you just say a word about who this man was and then maybe just give us a little sketch of the episode?

Wallace was a completely brilliant, self-taught naturalist and had been in the Malaysia, Indonesia regions for three or four years before he was in touch with Darwin.

I think the word discovery is not quite right.

He formulated a theory of natural selection using the same sources that Darwin used, funnily enough.

And being extremely impressed by Charles Lyell and other authors, he formulated the same theory, just a little different in one or two places, and sent it to Darwin, who he had begun a correspondence with, so that they absolutely were working in the same framework.

And this was in 1858.

And Wallace wasn't really involved in any of the publication work.

So, I mean, I guess, first of all, why did he omit much discussion of humans and human origins in The Origin of Species? Was it time pressure? Was it some general reluctance? Did he not know what he thought yet?