CONTENTS 
PART I 
THE MEANING OF DOMESTICATED RACES AND THE 
MANNER OF THEIR IMPROVEMENT 
CHAPTER 
I. THe DEPENDENCE OF Man UPON DOMESTICATED ANIMALS 
AND PLANTS 
Animals and plants as sources of food — As sources of cloth- 
ing — As sources of shelter — Vegetable products as sources 
of heat and light — Dependence of man upon animal labor — 
Animals a means of recreation — Animals and plants as sources 
of raw material for manufacturing purposes — Medicinal prop- 
erties of animals and plants — The business of farming 
II. DomeEsTICATED RACES ORIGINATED IN THE WILD . 
Domesticated races vary — Creation not yet finished — Most 
domesticated races have close relatives in the wild — Domesti- 
cated species existed first in the wild — Species change in domes- 
tication — Improvement sometimes slight — Domestication a 
gradual process — How the history of domestication is known 
— Not always able to identify the original — Distinction between 
feral and wild 
III. How ANIMALS AND PLANTS CAME TO BE DOMESTICATED 
Domestication the result of necessity — Need for help in the 
hunt — Need for additional food — Need for clothing and shel- 
ter — Need for labor — Domestication the first step in civiliza- 
tion — The civilizing effect of slavery — What animals have 
done for us — Unused materials — Lost possibilities —Domes- 
tication a gradual process — Species that were domesticated 
IV. NEED oF IMPROVEMENT IN DOMESTICATED ANIMALS 
AND PLANTS. 
Natural species not perfectly adjusted to our needs — Main- 
tenance of animals costly — Further improvement needed — 
Need of more economic service — Some individuals better 
than others — Economic significance of differences in efficiency 
— The fact of variability established — Variability in a single 
character — Historical knowledge of original species needed 
Xi 
PAGE 
It 
35 
