"Apo Kayan or Usun Apo is the country from which the Batang Kayan river or Bulungan, the Kotei, and their great tributaries rise on the one side, and the tributaries of the Rejang and Baram on the other. It extends from the Bahau river in the north to the Mahakam in the south. The Kenyahs of the Baram are spoken of by the people of the Batang Kayan as Kenyah Bau."
[227] — In order to make Kohlbrugge's data comparable with ours I have in all cases grouped his youths and girls over 16 with the adults, and have left those younger out of reckoning.
[228] — I.E. having an index of 77.9 and under.
[229] — This was drawn up by Dr. Hose from his general knowledge of the people of Sarawak, and it will be found to agree very closely with the anthropometric data, thus we may regard it as expressing the present state of our knowledge of the affinities of the several tribes.