CK defended CD’s theory at a shooting party with the Bishop of Oxford, the Duke of Argyll, and Lord Ashburton. The discussion started as a result of shooting some blue rock-pigeons which were different from blue rocks of other localities. CK held that all pigeons were descended from one species.

CK proposed that mythological races, e.g., elves and dwarfs, were intermediate species between man and apes, and have become extinct by natural selection; i.e., by competition with a superior white race of man.