The sincerity of Darwin really admitted this; and that is how we came to use such a term as the Missing Link. But the dogmatism of Darwinians has been too strong for the agnosticism of Darwin; and men have insensibly fallen into turning this entirely negative term into a positive image. They talk of searching for the habits and habitat of the Missing Link; as if one were to talk of being on friendly terms with the gap in a narrative or the hole in an argument, of taking a walk with a non-sequitur or dining with an undistributed middle.
Strictly speaking of course we know nothing about prehistoric man, for the simple reason that he was prehistoric. The history of prehistoric man is a very obvious contradiction in terms. It is the sort of unreason in which only rationalists are allowed to indulge.