... immediately, this course of events seems to be in contradiction with the facts of savage society at the present day and with all probability. Apart from that however, how does Mr Morgan suppose his eugenic diathesis to be transmitted? It can hardly be maintained that this was the result of the different social conditions of the families in which brothers and sisters intermarried. Obviously there would be nothing to prevent ... — Kinship Organisations and Group Marriage in Australia • Northcote W. Thomas