In Sarawak these people are spoken of consistently as “Sea Dayaks,” or more generally “Dayak.” It is customary for the Dutch and other Europeans to term all the interior tribes of Borneo “Dayak,” with or without a qualifying designation. As there is such confusion of the terminology in the text-books, I consider it better to boldly face the situation and to introduce a new term to science to which a perfectly definite meaning can be applied.
Most of the Iban inhabit low-lying land; they prefer to live on the low hills, but this is not always practicable, and so they plant swamp padi. All those who settle at the heads of rivers plant padi on the hills in the same manner as the up-river natives. They also cultivate maize, sugar-cane, sweet potatoes, gourds, pumpkins, cucumbers, melons, mustard, ginger, and other vegetables. Generally groups of relations work together in the fields.
Although they are essentially an agricultural people, they are warlike and passionately devoted to head-hunting. The Iban of the Batang Lupar and Saribas in the olden days joined the Malays in their large war prahus on piratical raids along the coast and up certain rivers. Although they probably never went out a very great distance on the sea, by coasting they were able to attack numerous villages round the coast, and they owe their name of Sea Dayaks to this practice. The great piratical forays were organised by Malays, who went for plunder, but they could always induce the Iban to accompany them on the promise that all the heads of the slain should fall to their share.
Of the Iban, the Balaus, who live in and about the Lingga River, are the most efficient in handling boats at sea. The inland Iban of the present day are usually inexpert boatmen in rough weather, and even in river work they are nothing like so reliable in emergencies as the up-river Kenyahs.
The Iban women make beautiful cotton cloths on a very simple loom. The intricate patterns are made by tightly tying up several strands of the warp with leaves at varying intervals and then dipping the whole into a dye. On removing the lashing the threads that were tied are found to be undyed. This process is repeated if a three-colour is desired. The pattern is produced solely in the warp; the woof threads are self-coloured, and are not visible in the fabric, which is therefore a cotton rep. I have accumulated material for a special study of the numerous designs woven and embroidered by Iban women, as well as of the elegant patterns engraved in low relief on bamboos by the men, but there has not been time to work them out. It is an interesting fact that the decorative art of the two sexes is entirely distinct in motive and style.
The Iban women did not tattoo, though a few may now be seen with a little tattooing; but most of the men have adopted the custom from the Kayans. They admit that the tattoo marks are Kayan designs, but it very rarely happens that the Iban transfer such a design to their bamboo decorations, and the Iban women never adopt Kayan or tattoo patterns for their fabrics.
It is probable that the Iban belongs to the same stock as the original Malay. If this view is correct, the Iban migration may be regarded as the first wave of the movement that culminated in the Malay Empire.
The Malay must have come to Borneo not later than the early part of the fifteenth century, as Brunei was a large and wealthy town in 1521. Probably the Malays came directly from the Malay Peninsula, but they must have mixed largely with the Kadayans, Mĕlanaus, and other coastal people.
The Sarawak and Brunei Malays are probably mainly coastal Borneans with some Malay blood; but they have absorbed the Malay culture, spirit, and religion.
The movements of the different peoples which I have so briefly sketched have a sociological significance which is worth tracing in detail, but I do not propose to inflict on my present readers anything more than the merest outline of this interesting line of inquiry.