226 THE SOCIAL LIFE OF ANIMALS 



density of people per square mile of the earth's sur- 

 face, but also in the population density of the most 

 crowded nations. The degree of crowding in cer- 

 tain countries with whose problems we are familiar 

 is shown in the following list. The figures given are 

 slightly rounded statements of the average popula- 

 tion density per square mile of land territory. The 

 most densely populated countries of the world are 

 listed here in order (94): 



For many purposes it is hardly fair to compare 

 the relatively small countries like Belgium and the 

 Netherlands with others like Japan or Italy which 

 are larger but contain a high percentage of waste 

 land. For our purposes, however, the list as it stands 

 is fair enough; such data represent the facts we have 

 to face. 



At present about two and a half acres are required 



