The following sketch of the races and peoples of Borneo is based upon the observations of the Cambridge Expedition to Sarawak in 1899 and those of Dr. A. W. Nieuwenhuis in his expeditions to Netherlands Borneo in 1894, 1896 — 1897, and 1898 — 1900 (QUER DURCH BORNEO, Leiden, vol. i., 1904, vol. ii., 1907).
It is generally acknowledged that in Borneo, as in other islands of the East Indian Archipelago, the Malays inhabit the coasts and the aborigines the interior, though in some these reach the coast while Malayised tribes have pushed inland up the rivers, a sharp distinction between the two being frequently obliterated where they overlap. The condition, however, is much more complicated as we can now distinguish at least two main races among the aborigines.
We have no evidence as to who were the primitive inhabitants of Borneo. One would expect to find Negritos in the interior, as these black, woolly-haired pygmies inhabit the Andamans, parts of the Malay Peninsula, Sumatra, the Philippines, New Guinea, and possibly Melanesia. No authoritative evidence of their occurrence in Borneo is forthcoming, and one can confidently assert that there are no Negritos in Sarawak. Nor are there any traces of Melanesians. It is generally admitted that, assuming the Australians to be mainly of that race, a Pre-Dravidian element should occur in the Archipelago, and the cousins Sarasin have noted this strain among the Toalas of Celebes and Moszkowski among the Batins of Sumatra; in this connection it is of interest that Nieuwenhuis discovered ten Ulu Ayars and two Punans with straight hair and a "black or blue-black" skin colour; Kohlbrugge,[223] who records this observation, offers no explanation.
Dr. E. T. Hamy in 1877 recognised a primitive element in the Malay Archipelago, for which he adopted the term Indonesian, a name previously invented by Logan for the non-Malay population of the East Indian Archipelago. De Quatrefages and Hamy further established this stock in their CRANIA ETHNICA (1882), and de Quatrefages in his HISTOIRE GENERALE DES RACES HUMAINES (1889) boldly states that these high- and narrow-headed peoples are "un des rameaux de la branche blanche allophyle" (L.C. pp. 515, 521). Keane terms the Indonesians "the pre-Malay Caucasic element in Oceania" (MAN PAST AND PRESENT, 1899, p. 231). Various investigators[224] have studied skulls obtained from this region which prove the wide extension of dolichocephaly. Kohlbrugge (1898), who investigated the Teriggerese, Indonesian mountaineers of Java, says: "Les Indonesiens sont dolichocephales, les Malais brachycephales ou hyperbrachycephales. Le sang indonesien se decele donc par la longueur de la tete: plus celle-ci se rapproche du type dolichocephale, plus pur est le sang indonesien." Volz confirms Hagen's observations of the existence among the Battak of North Sumatra of two types, a dolichocephalic Indonesian and a brachycephalic type.
The term Indonesian may now be regarded as definitely restricted to a dolichocephalic, and the term Proto-Malay to a brachycephalic race, of which the true Malays (Orang Malayu) are a specialised branch.
The next point to discuss is the presence of these two races in Borneo. The Dutch Expedition found three distinct types in the interior of Netherlands Borneo, the Ulu Ayars (Ulu Ajar)[225] or Ot Danum of the upper Kapuas, the Bahau-Kenyahs (Bahau-Kenja) of the middle or upper Mahakam (or Kotei) and the upper waters of the rivers to the north, and the Punans, nomadic hunters living in the highlands about the head-waters of the great rivers. The first of these may be classed as predominantly Indonesian and the others as mainly Proto-Malay in origin. According to Nieuwenhuis the Bahaus and Kenyahs both remember that they came from Apo Kayan at the headwaters of the Kayan river; they were formerly known as the Pari tribes. In all the tribes of this group the social organisation is in the main similar, and this affinity is borne out by their material culture, thus they may be regarded as originally one people. Tribes calling themselves Bahau now live along the Mahakam above Mujub and include one Kayan group; on the upper Rejang are Bahau tribes under the name of Kayan, and a small section has advanced into the Kapuas area and settled on the Mendalam which again includes Kayans and kindred tribes. All the tribes still in Apo Kayan call themselves Kenyah, as also those of the eastward flowing Tawang, Berau and Kayan (or Bulungan) rivers and those of the upper Limbang and Baram flowing northwards. The Kenyahs of Apo Kayan live along the Iwan, a tributary of the Kayan river (or Bulungan); to the north-east is another tributary called the Bahau which seems to have been the original home of the Bahau people since the tribes of Borneo habitually take their names from the rivers along which they live.[226]
Nieuwenhuis came to the conclusion that the three chief tribes measured by him represented three main groups of the population of Central Borneo, physically and culturally. Mr. E. B. Haddon drew attention (MAN, 1905 No. 13, p. 22) to the close similarity of the results published by Kohlbrugge (1903) with those published by me (1901). I recognised five main groups of peoples in Sarawak: Punan, Klemantan (or, as Dr. Hose and I then spelled it, Kalamantan), Kenyah-Kayan, Iban or Sea Dayak, and Malay. The Ibans are not referred to by either of the Dutch ethnologists, who, like myself, merely alluded to the Malay element. Kohlbrugge and I included the Bakatan or Beketan and the Ukit or Bukat in the Punan group, and also bracketed together the Kayans and Kenyahs. In Sarawak there are numerous and often small tribes which it is frequently very difficult or quite impossible to differentiate from one another, although the extremes of the series can be distinguished; we therefore decided to comprehend them under the non-committal term of Klemantan (p. 42). I showed that they were of mixed origin, and stated that, "It is possible that the Kalamantans were originally a dolichocephalic people who mixed first with the indigenous brachycephals (Punan group) and later with the immigrant brachycephals (Kenyah-Kayan group) or the Kalamantans may have been a mixed people when they first arrived in Borneo and subsequently increased their complexity by mixing with these two groups" (L.C. p. 352). I also made it clear that I regarded the dolichocephalic element as of Indonesian stock and the brachycephalic of Proto-Malayan origin. It was with great satisfaction that I found Kohlbrugge had come to similar conclusions and that the Ulu Ayars exhibit such strong traces of an Indonesian origin, stronger perhaps than those of any tribe in Sarawak, with the possible exception of the scarcely studied Muruts and allied tribes.
Kohlbrugge states (1903, p. 2) that he has shown for the interior of Sumatra, Java, and Celebes that there are mesaticephalic peoples distinct in other respects from the coast peoples, but not dolichocephalic. He concludes that the (Ulu Ayar) Dayaks, being the only dolichocephals, are the only pure Indonesians, and the rest (Kayans and Punans) are more or less mixed with Malays. The mean cephalic index of 130 Tenggerese of the interior of Java is 79.7, but the Ulu Ayars constitute a uniform group which ranges from 7 1 to 81.4, of which 9 are 74 or under and 9 are between 74.1 and 76 inclusive, the median of 26 adult males being 74.7.[227] [Although the median Kalabit index in the living subject is somewhat higher, that of the skulls, as well as the cranial index of Muruts and Trings (Table C), is very similar in this respect to that of the Ulu Ayars.]
According to Nieuwenhuis' statistics, as given by Kohlbrugge, there is in the brachycephalic group (Kayans and Punans) a greater range (75 to 93.3, and 1 Kayan woman reaches 97) than in the Ulu Ayars; most fall between 78 and 85, the medians of both being just over 81. There are 8 dolichocephals[228] out of his 43 Kayan men and 4 out of his 25 women, but only I Punan out of 14. In his curve of the Kayan indices there is a drop at 82 A comparison is also possible between the bi-zygomatic breadths made by Nieuwenhuis and ourselves. The figures are those of the minimum, median, and maximum. KAYANS (43 [male], N) 126, 139, 153 ; (25 [female], N) 125, 132, 141; (21 [male], H) 132, 141, 150. PUNANS (14 [ERROR: unhandled ♂], N) 132, 138, 145; (19 [male], H) 130, 142, 154. ULU AYARS (26 [male], N) 12 5, 136, 145. LAND DAYAKS (42 [male], S) 122, 136, 145.