The origin of a dual organisation is generally believed to be due to fission, but it is more reasonable to regard it as due to fusion, as hostility is so frequently manifest between the two groups despite the fact that spouses are always obtained from the other moiety. In New Ireland (and elsewhere) each moiety is associated with a hero; one acts wisely but unscrupulously, the other is a fool who is always falling an easy victim to the first. Each moiety has a totem bird: one is a fisher, clever and capable, while the second obtains its food by stealing from the other and does not go to sea. One represents the immigrants of superior culture who came by sea, the other the first people, aborigines, of lowly culture who were quite unable to cope with the wiles and stratagems of the people who had settled among them. In the Gazelle Peninsula of New Britain, the dual groups are associated with light and dark coconuts; affiliated with the former are male objects and the clever bird, which is universally called _taragau_, or a variant of that term. The bird of the other moiety is named _malaba_ or _manigulai_, and is associated with female objects. The dark coconuts, the dark colour and flattened noses of the women who were produced by their transformation, and the projecting eyebrows of the _malaba_ bird and its human adherents seem to be records in the mythology of the Bismarck Archipelago of the negroid (or, Rivers suggests, an Australoid) character of the aboriginal population. The light coconut which was changed into a light-coloured woman seems to have preserved a tradition of the light colour of the immigrants. The autochthones of Melanesia were a dark-skinned and ulotrichous people, who had neither a fear of the ghosts of their dead nor a manes cult, but had a cult of local spirits. The Baining of the Gazelle Peninsula of New Britain may be representatives of a stage of Melanesian history earlier than the dual system; if so, they probably represent in a modified form, the aboriginal element. They are said to be completely devoid of any fear of the dead. The immigrants whose arrival caused the institution of the dual system were a relatively fair people of superior culture who interred their dead in a sitting position and feared their ghosts. They first introduced the Austronesian language. All subsequent migrations were of Austronesian-speaking peoples from Indonesia. First came the kava-peoples in various swarms, and more recently the betel-people.