The publications of the Research Group for European mi gration problems represent studies by independent writers. These studies do not form an integrated whole, but are inter related by their subject, namely, European and international migration. The topic is, therefore, approached in various ways, like a discussion in which experts from different spheres of activity expose their views on population in Europe. The writers not necessarily always agree in their opinions. The series must do surely be all the more valuable be ause of this, since the solution of the problem of over-population in...