THE MIGRATION OF POPULATIONS 89 
an essential to the active relief of difficulties arising 
through over-dense aggregations of the world’s peoples. 
In this connection it is also to be noted that it has 
already appeared that persons in one territory, antici- 
pating trouble for itself from population-growth, 
have advocated that another territory not under its 
political control directly or indirectly should freely 
open its borders to immigrants, because, according to 
the (uninformed) judgments of these persons, the other 
territory is capable of increasing its population-density. 
Since, however, the recipient country carries all the 
economic and political consequences of its immigration 
policy, such advocacy is unwarrantable, and dictation 
in the matter would but intensify the difficulties already 
in existence. Readiness to consign troubles to others 
is not an unknown feature even in national human 
conduct.