IN his attempt to analyse the conditions and stimuli underlying human migrations, Dr. Numelin has cast his net over the entire world, and has considered human movements from Palæolithic times down to the present day. But, although his many citations show that the physical and social conditions promoting migration are very complex, his methods and criteria are too vague to yield satisfactory results.
The Wandering Spirit:
a Study of Human Migration. By Dr. Ragnar Numelin. Pp. xvi + 375. (London: Macmillan and Co., Ltd., 1937.) 20s. net.