DOMESTICATED ANIMALS 



INTRODUCTION 



One of the effects of the modern advance in natural 

 science has been greatly to increase the attention which is 

 devoted to the influences that the conditions of diverse 

 peoples have had upon their development. Man is no longer 

 looked upon, as he was of old, as a being which had been 

 imposed upon the earth in a sudden and arbitrary manner, 

 set to rule the world into which he had been sent as a 

 master. We now see him as one of the myriad species which 

 has won its way by powers of mind out of darkness and the 

 great struggle to the place of command. The way in which 

 this creature, weak in body and exceedingly dependent on 

 his surroundings, has in the modern geologic epoch come 

 forth from the mass of the lower animals, is by far the most 

 impressive and as yet the most unexplained phenomenon 

 which the geologist has to consider. It is not likely that the 

 marvellous advancement can be accounted for by any single 

 cause ; it is probably due, as are most of the great evolutions, 

 to the concurrence of many influences ; but among these 

 which make for advance, we clearly have to reckon the 

 animals and plants which man has learned to associate with 

 his work of the household and the fields. 



Although certain species of insects, particularly the ants, 

 have the well-developed habit of subjugating certain creat- 



