LENGTH OF FEET IN CORRELATION WITH LENGTH OF BEAK--LENGTH OF STERNUM,
SCAPULA, AND FURCULUM--LENGTH OF WINGS--SUMMARY ON THE POINTS OF DIFFERENCE
IN THE SEVERAL BREEDS.


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.


CHAPTER 1.VII.

FOWLS.

BRIEF DESCRIPTIONS OF THE CHIEF BREEDS--ARGUMENTS IN FAVOUR OF THEIR
DESCENT FROM SEVERAL SPECIES--ARGUMENTS IN FAVOUR OF ALL THE BREEDS HAVING
DESCENDED FROM GALLUS BANKIVA--REVERSION TO THE PARENT-STOCK IN COLOUR--
ANALOGOUS VARIATIONS--ANCIENT HISTORY OF THE FOWL--EXTERNAL DIFFERENCES
BETWEEN THE SEVERAL BREEDS--EGGS--CHICKENS--SECONDARY SEXUAL CHARACTERS--