INTRODUCTION. 
varieties in their colour,, all the fineness and length 
of their hair, together with the depending length 
of their ears., seem to have arisen from a long con- 
tinuance of domestic slavery. What an immense 
variety is there to be found in the ordinary race of 
dogs and horses ; the principal differences of which 
has been effected by the industry of man., so adapt- 
ing the food, the treatment, the labour, and the 
climate, that the tame animal seems in soma in- 
stances no^longer to have any resemblance to his 
ancestors in the woods around him. 
In this manner, nature is under a kind of con- 
straint, in those animals we have taught to live in 
a state of servitude near us. The savage animals 
preserve the marks of their first formation ; their 
colours are generally the same ; a rough dusky 
brown, or a tawny, seem almost their only varieties. 
But it is otherwise in the tame ; their colours 
are various, and their forms different from each 
other. The nature of the climate, indeed, ope-? 
rates upon all ; but more particularly on these. 
That nourishment which is prepared by the hand 
of man, not adapted to their appetites, but to suit 
his own convenience, that climate, the rigours of 
which he can soften, and that employment to which 
they are sometimes assigned, produce a number of 
distinctions that are not to be found among the 
savage animals. These at first were accidental, 
hut in time became hereditary ;• and a new race 
of artificial monsters are propagated, rather to 
answer to the purposes of human pleasure, than 
their own convenience* „ In short, their very ap~ 
