154 MAN IN THE SUDAN and who have won their way onward as far as South Africa, founding kingdoms and impressing their indivdduahty wherever they went.

It would seem once again a demonstration of the survival of the fittest, for the more virile and intelligent divisions would be uncontent to remain in localities scarce fit for beasts, much less for man, and would leave them to those who trusted to inaccessibility for safety. The marshes of Southern Ethiopia provided this in excelsis, protected these negroids from intermixture with the Arab immigrants, whose blood has so profoundly permeated many of the races of the north and east, and developed physical characteristics which mark them from all other men.

Among the most prominent tribes of the marsh class are the Dinkas, Shilluks, Nuers, Buruns, Anuaks, Bari, Shuli, and Jur, and as representatives of races who by their surroundings have been kept in the most primitive condition—not necessarily the most unintelligent or unresponsive to effort they are very interesting.

The natives of Australia are low in the human scale, and, apart from the almost bestial powers which they share with the bushman, they are merely undevelopable. No one who has come into touch with a Dinka or Nuer who has had the benefit of contact with a higher civilization, could say so of him. Farag EfFendi Abu Zet, now resident near Singa, is an example ; a born soldier, he is covered with decorations, was promoted on