Comparison of different skills

The caption reads: So far as we can dimly guess at the first inhabitants of Africa, they probably belonged over nearly the whole of the continent to a primitive negro stock not very dissimilar to the Bushmen. and perhaps to the Congo Pygmies at the present day. In that island like projection of Mauritania; From specimens in the Museum of the Royal College of Surgeons. The picture features five different skulls coming from African West Coast, Malagasy, Bushman.