Equally important for the interpretation of ethnic facts, are their geographical associations, their distribution. Is a custom or invention peculiar to one people or is it shared by many distinct peoples occupying a continuous area? Such a question may seem trivial. But the answer usually bears heavy significance. A unique institution, or one found in various spots but in disconnected ones, is, other things equal, either of recent and independent origin in each locality, or it is a lingering survival of a custom that was once wide-spread. In short, it represents the beginning or end of a process of development.