(M151) In this last case the expulsion of evils, if I am right in so interpreting the ceremony, is periodic, not occasional, being repeated every spring at the beginning of a new year. It brings us accordingly to the consideration of a whole class of such cases, for the mediate expulsion of evils by means of a scapegoat or other material vehicle, like the immediate expulsion of them in invisible form, tends to become periodic, and for a like reason. Thus in Perak, a state on the west coast of the Malay Peninsula, it was in ancient times the custom to perform periodically a ceremony intended to ensure the prosperity of the country by the propitiation of friendly spirits and the expulsion of evil influences. The writer who records the custom is uncertain as to the period which elapsed between two successive celebrations; he suggests with hesitation that the rite was performed once in seven years or once in a Rajah’s reign. The name of the ceremony was _pĕlas negri_, which means “the cleansing of the country from evils.” When the time came, the Rajah, the chiefs, and a great following of people assembled at a point as far up the river as possible, but short of the rapids which further up impede navigation. There a number of rafts were prepared, some of them elaborately built with houses on them. Four of them were devoted to the four great classes of spirits which are found in Perak, namely the _Hantu Blian_ or “Tiger-spirits,” the _Hantu Sungkei_, the _Hantu Malayu_, and the _Jin Raja_. In each of these rafts a number of wizards (_pawangs_) took up their post, according to the particular class of demon which they affected. The procession was headed by the raft devoted to the Tiger-spirits; and in it was set up a _prah_ tree with all its branches, kept erect by stays. It was followed by the three rafts dedicated to the other three classes of spirits, and behind them came a train of other rafts bearing mere common mortals, the royal bandsmen, the Rajah himself, the chiefs, and the people. As the long procession floated down the river with the current, the wizards, standing on sheets of tin, waved white cloths and shouted invocations to the spirits and demons who inhabited the country through which the rafts were drifting seaward. The burden of the invocations was to invite the spirits and demons to come aboard the rafts and partake of the food which had been considerately made ready for them. At every village on the bank large enough to possess a mosque (for the Malays of Perak are professing Mohammedans) the procession halted; a buffalo, subscribed for by the inhabitants, was slaughtered, and its head placed on one of the spirit-barks, while people feasted on the flesh. The ceremony ended at Bras Basah, a village on the left bank of the Perak river, not far from its mouth. There the rafts were abandoned to the current, which swept them out to sea,(496) doubtless bearing with them the