He divided the human species into five races in 1779 , later founded on crania research ( description of human skulls ) , and called them ( 1793\/1795 ) : Further anatomical study led him to the conclusion that ` individual Africans differ as much , or even more , from other individual Africans as Europeans differ from Europeans ' .
Anatomical study led him to the conclusion that ` individual Africans differ as much , or even more , from other individual Africans as Europeans differ from Europeans ' .