The Mohammedan population, being of very heterogeneous ethnic composition, and having adopted a culture of foreign origin, which may be better studied in other regions of the earth where the Malay type and culture is more truly indigenous, seems to us to be of secondary interest to the anthropologist as compared with the less cultured pagan tribes. We shall therefore confine our attention to the less known pagan tribes of the interior; and when we speak of the people of Borneo in general terms it is to the latter only that we refer (except where the "Malays" are specifically mentioned). Of these we distinguish six principal groups: (1) Sea Dayaks or Ibans, (2) the Kayans, (3) Kenyahs, (4) Klemantans, (5) Muruts, (6) Punans.
A census of the population has been made in most of the principal districts of Sarawak and of Dutch Borneo; but as no census of the whole country has hitherto been made, it is impossible to state with any pretence to accuracy the number of the inhabitants of the island. Basing our estimate on such partial and local enumerations as have been made, we believe the total population to be about 3,000,000. Of these the Chinese immigrants and their descendants, who are rapidly increasing in number, probably exceed 100,000. The Malays and the native converts to Islam, who constitute with the Chinese the population of the towns and settled villages of the coast districts, probably number between three and four hundred thousand; the Indian immigrants are probably not more than 10,000; the Europeans number perhaps 3000; the rest of the population is made up of the six groups of barbarians named in the foregoing paragraph.
Any estimate of the numbers of the people of each of these six divisions is necessarily a very rough one, but it is perhaps worth while to state our opinion on this question as follows: Klemantans, rather more than 1,000,000; Kenyahs, about 300,000; Muruts, 250,000; Sea Dayaks, 200,000; Kayans, 150,000; Punans and other peoples of similar nomadic habits, 100,000 — I.E. a total of 2,000,000.
(1) Of all these six peoples the Sea Dayaks have become best known to Europeans, largely owing to their restless truculent disposition, and to the fact that they are more numerous in Sarawak than any of the others. They have spread northwards over Sarawak during the latter half of the last century, chiefly from the region of the Batang Lupar, where they are still numerous. They are still spreading northward, encroaching upon the more peaceful Klemantan tribes. They are most densely distributed in the lower reaches of the main rivers of Sarawak, especially the Batang Lupar and Saribas rivers, which are now exclusively occupied by them; but they are found also in scattered communities throughout almost all parts of Sarawak, and even in British North Borneo, and they extend from their centre in Sarawak into the adjacent regions of Dutch Borneo, which are drained by the northern tributaries of the Great Kapuas River.
The Sea Dayak is of a well-marked and fairly uniform physical type. His skin is distinctly darker than that of the other peoples of the interior, though not quite so dark as that of most of the true Malays. The hair of his head is more abundant and longer than that of other peoples. His figure is well proportioned, neat, and generally somewhat boyish. His expression is bright and mobile, his lips and teeth are generally distorted and discoloured by the constant chewing of betel nut. They are a vain, dressy, boastful, excitable, not to say frivolous people — cheerful, talkative, sociable, fond of fun and jokes and lively stories; though given to exaggeration, their statements can generally be accepted as founded on fact; they are industrious and energetic, and are great wanderers; to the last peculiarity they owe the name of Iban, which has been given them by the Kayans, and which has now been generally adopted even by the Sea Dayaks themselves.
The good qualities enumerated above render the Iban an agreeable companion and a useful servant. But there is another side to the picture: they have little respect for their chiefs, a peculiarity which renders their social organisation very defective and chaotic; they are quarrelsome, treacherous, and litigious, and the most inveterate head-hunters of the country; unlike most of the other peoples, they will take heads for the sake of the glory the act brings them and for the enjoyment of the killing; in the pursuit of human victims they become possessed by a furious excitement that drives them on to acts of the most heartless treachery and the most brutal ferocity.
All the Sea Dayaks speak one language, with but slight local diversities of dialect. It is extremely simple, being almost devoid of inflections, and of very simple grammatical structure, relying largely on intonation. It is closely allied to Malay.
(2) The Kayans are widely distributed throughout central Borneo, and are to be found in large villages situated on the middle reaches of all the principal rivers with the exception of those that run to the north coast. They occupy in the main a zone dividing the districts of the lower reaches of the rivers from the central highlands from which all the rivers flow.
They are a warlike people, but less truculent than the Sea Dayaks, more staid and conservative and religious, and less sociable. They do not wantonly enter into quarrels; they respect and obey their chiefs. They are equally industrious with the Sea Dayaks, and though somewhat slow and heavy in both mind and body, they are more skilled in the handicrafts than any of the other peoples. They also speak one language, which presents even less local diversity than the Sea Dayak language.
(3) The Kenyahs predominate greatly in the highlands a little north of the centre of Borneo where all the large rivers have their sources; but they are found also in widely scattered villages throughout the Kayan areas. In all respects they show closer affinities with the Kayans than with the Sea Dayaks; as regards custom and mode of life they closely resemble the Kayans, with whom they are generally on friendly terms; but they are easily distinguished from the Kayans by well-marked differences of bodily and mental characters, as well as by language. Physically they are without question the finest people of the country. Their skin-colour is decidedly fairer than that of Sea Dayaks or Kayans. They are of medium stature, with long backs and short, muscular, well-rounded limbs; a little stumpy in build, but of graceful and vigorous bearing. They are perhaps the most courageous and intelligent of the peoples; pugnacious, but less quarrelsome than the Sea Dayak; more energetic and excitable than the Kayan; hospitable and somewhat improvident, sociable and of pleasant manners; less reserved and of more buoyant temperament than the Kayan; very loyal and obedient to their chiefs; more truthful and more to be depended upon under all circumstances than any of the other peoples, except possibly the Kayans.