CONTENTS. Vll 



SKULL OF HALF-LOP EABBITS — VARIATIONS IN THE SKULL 

 ANALAGOUS TO DIFFERENCES IN DIFFERENT SPECIES OF HARES — 

 VERTEBRA — STERNUM — SCAPULA — EFFECTS OF USE AND DISUSE ON 

 THE PROPORTIONS OF THE LIMBS AND BODY — CAPACITY OF THE 

 SKULL AND REDUCED SIZE OF THE BRAIN — SUMMARY ON THE 

 MODIFICATIONS OF DOMESTICATED RABBITS .. .. Pages 107-13G 



CHAPTER Y. 



DOMESTIC PIGEONS. 



ENUMERATION AND DESCRIPTION OF THE SEVERAL BREEDS — INDIVIDUAL 

 VARIABILITY — VARIATIONS OF A REMARKABLE NATURE — OSTEO- 

 LOGICAL CHARACTERS : SKULL, LOWER JAW, NUMBER OF VERTEBRA 

 — CORRELATION OF GROWTH: TONGUE WITH BEAK; EYELIDS AND 

 NOSTRILS WITH WATTLED SKIN — NUMBER OF WING-FEATHERS AND 

 LENGTH OF WING — COLOUR AND DOWN — WEBBED AND FEATHERED 

 FEET — ON THE EFFECTS OF DISUSE — LENGTH OF FEET IN CORRE- 

 LATION WITH LENGTH OF BEAK — LENGTH OF STERNUM, SCAPULA, 

 AND FURCULUM — LENGTH OF WINGS — SUMMARY ON THE POINTS 

 OF DIFFERENCE IN THE SEVERAL BREEDS 137-188 



CHAPTER VI. 

 pigeons — continued. 



ON THE ABORIGINAL PARENT-STOCK OF THE SEVERAL DOMESTIC RACES 

 — HABITS OF LIFE — WILD RACES OF THE ROCK-PIGEON — DOVECOT- 

 PIGEONS — PROOFS OF THE DESCENT OF THE SEVERAL RACES FROM 

 COLUMBA LIVIA — FERTILITY OF THE RACES WHEN CROSSED — RE- 

 VERSION TO THE PLUMAGE OF THE WILD ROCK-PIGEON — CIRCUM- 

 STANCES FAVOURABLE TO THE FORMATION OF THE RACES — AN- 

 TIQUITY AND HISTORY OF THE PRINCIPAL RACES — MANNER OF 

 THEIR FORMATION — SELECTION — UNCONSCIOUS SELECTION — CARE 

 TAKEN BY FANCIERS IN SELECTING THEIR BIRDS— SLIGHTLY DIF- 

 FERENT STRAINS GRADUALLY CHANGE INTO WELL-MARKED BREEDS 

 — EXTINCTION OF INTERMEDIATE FORMS— CERTAIN BREEDS REMAIN 

 PERMANENT, WHILST OTHERS CHANGE — SUMMARY.. .. 189-235 



