All theories as to the primitive man must be very uncertain. Granting the doctrine of evolution to be true, man must be held to have a common ancestor with the rest of the Primates. But then we do not know what their common ancestor was like. If ever we are to have a distinct conception of him, it can only be after long years of future researches and the laborious accumulation of materials, scarcely the beginning of which now exists. But science has already done something for us.