Chapter 1.vi.

PIGEONS--continued.

ON THE ABORIGINAL PARENT-STOCK OF THE SEVERAL DOMESTIC RACES--HABITS OF LIFE--WILD RACES OF THE ROCK-PIGEON--DOVECOTE-PIGEONS--PROOFS OF THE DESCENT OF THE SEVERAL RACES FROM COLUMBA LIVIA--FERTILITY OF THE RACES WHEN CROSSED--REVERSION TO THE PLUMAGE OF THE WILD ROCK-PIGEON-- CIRCUMSTANCES FAVOURABLE TO THE FORMATION OF THE RACES--ANTIQUITY AND HISTORY OF THE PRINCIPAL RACES--MANNER OF THEIR FORMATION--SELECTION-- UNCONSCIOUS SELECTION--CARE TAKEN BY FANCIERS IN SELECTING THEIR BIRDS-- SLIGHTLY DIFFERENT STRAINS GRADUALLY CHANGE INTO WELL-MARKED BREEDS-- EXTINCTION OF INTERMEDIATE FORMS--CERTAIN BREEDS REMAIN PERMANENT, WHILST OTHERS CHANGE--SUMMARY.