The Descent of Man Volume 1 Chapter VII - On the Races of Man Part 4

In which the nuanced differences among human races are examined with a careful eye, revealing that these distinctions cannot be adequately explained by environmental influences, use of parts, or correlated development alone, thus suggesting the subtle yet potent role of sexual selection. Furthermore, the remarkable anatomical and developmental parallels between the brains of man and the higher apes are explored in detail, affirming their close kinship while acknowledging certain differences of degree rather than kind.