CONTENTS. 



INTRODUCTION Pages 1-14 



CHAPTER I. 



DOMESTIC DOGS AND CATS. 



ANCIENT VARIETIES OF THE DOG — RESEMBLANCE OF DOMESTIC DOGS 

 IN VARIOUS COUNTRIES TO NATIVE CANINE SPECIES — ANIMALS NOT 

 ACQUAINTED WITH MAN AT FIRST FEARLESS — DOGS RESEMBLING 

 WOLVES AND JACKALS — HABIT OF BARKING ACQUIRED AND LOST 



FERAL DOGS TAN-COLOURED EYE-SPOTS — PERIOD OF GESTATION 



OFFENSIVE ODOUR — FERTILITY OF THE RACES WHEN CROSSED — 



DIFFERENCES IN THE SEVERAL RACES IN PART DUE TO DESCENT 

 FROM DISTINCT SPECIES — DIFFERENCES IN THE SKULL AND TEETH 

 — DIFFERENCES IN THE BODY, IN CONSTITUTION — FEW IMPORTANT 



DIFFERENCES HAVE BEEN FIXED BY SELECTION DIRECT ACTION 



OF CLIMATE — WATER-DOGS WITH PALMATED FEET — HISTORY OF 

 THE CHANGES WHICH CERTAIN ENGLISH RACES OF THE DOG HAVE 

 GRADUALLY UNDERGONE THROUGH SELECTION — EXTINCTION OF THE 

 LESS IMPROVED SUB-BREEDS. 



CATS, CROSSED WITH SEVERAL SPECIES — DIFFERENT BREEDS FOUND 



ONLY IN SEPARATED COUNTRIES DIRECT EFFECTS OF THE 



CONDITIONS OF LIFE FERAL CATS INDIVIDUAL VARIABI- 

 LITY 15-50 



CHAPTER II. 



HORSES AND ASSES. 



HORSE. DIFFERENCES IN THE BREEDS— INDIVIDUAL VARIABILITY 



OF — DIRECT EFFECTS OF THE CONDITIONS OF LIFE — CAN WITHSTAND 

 MUCH COLD — BREEDS MUCH MODIFIED BY SELECTION - COLOURS OF 



