[Sidenote: Dyak belief that lewdness may cause bad weather and spoil the crops.] Similar views are held by various tribes of Borneo. Thus when the rain pours down steadily day after day and week after week, and the crops are rotting in the fields, the Dyaks of Borneo come to the conclusion that some one has been indulging in fleshly lusts; so the elders lay their heads together and adjudicate on all cases of incest and bigamy, and purify the earth with the blood of pigs, which appears to possess in a high degree the valuable property of atoning for moral guilt. For three days the villages are tabooed and all labour discontinued; the inhabitants remain at home, and no strangers are admitted. Not long ago the offenders, whose lewdness had thus brought the whole country into danger, would have been punished with death or at least slavery. A Dyak may not marry his first cousin unless he first performs a special ceremony called _bergaput_ to avert evil consequences from the land. The couple repair to the water-side, fill a small pitcher with their personal ornaments, and sink it in the river; or instead of a jar they fling a chopper and a plate into the water. A pig is then sacrificed on the bank, and its carcase, drained of blood, is thrown in after the jar. Next the pair are pushed into the water by their friends and ordered to bathe together. Lastly, a joint of bamboo is filled with pig’s blood, and the couple perambulate the country and the villages round about, sprinkling the blood on the ground. After that they are free to marry. This is done, we are told, for the sake of the whole country, in order that the rice may not be blasted.[386] The Bahaus or Kayans, a tribe in the interior of Borneo, [Sidenote: Kayan belief that adultery or fornication spoils the harvest.] believe that adultery is punished by the spirits, who visit the whole tribe with failure of the crops and other misfortunes. Hence in order to avert these calamities from the innocent members of the tribe, the two culprits, with all their possessions, are put in quarantine on a gravel bank in the middle of the river; then in order thoroughly to disinfect them, pigs and fowls are killed, and with the blood priestesses smear the property of the guilty pair. Finally the two are set on a raft, with sixteen eggs, and allowed to drift down the stream. They may save themselves by swimming ashore, but this is perhaps a mitigation of an older sentence of death by drowning. Young people shower long grass-stalks, which stand for spears, at the shamefaced and dripping couple.[387] The Blu-u Kayans of the same region similarly imagine that an intrigue between an unmarried pair is punished by the spirits with failure of the harvest, of the fishing, and of the hunt. Hence the delinquents have to appease the wrath of the spirits by sacrificing a pig and some rice.[388]