mainly to the systematic investigations of Dr. Seligmann and to the sporadic observations of missionaries, government officials and travellers, we have a good general knowledge of many of the peoples of the eastern coast of the south-eastern peninsula of New Guinea, and of some of the islands from the Trobriands to the Louisiades. The Ethnology of the fertile and populous Mekeo district has been mainly made known to us by the investigations of various members of the Sacred Heart Mission, and by Dr. Seligmann. What little we know of the Papuan Gulf district is due to missionaries among the coastal tribes, Mr. James Chalmers and Mr. W. Holmes. Dr. G. Landtman is at present investigating the natives of the delta of the Fly river and Daudai. The natives of the Torres Straits islands have also been studied as fully as is possible. But of the mountain region lying behind the Mekeo district very little indeed has been published; so Mr. Williamson's book fills a gap in our knowledge of Papuan ethnology.