Though Mohammedan laws were maintained in Sarawak, the worst abuses were purged out, as for instance, the death penalty for conjugal infidelity, and the sufficiency of a fine in extenuation of a murder. As for the Dayaks who formerly were cheated by Malay traders and robbed by Malay chiefs, they were permitted to enjoy absolute safety. Both Raja Brooke and his nephew, who succeeded him in the same spirit, followed the policy of making use of the natives themselves in governing, and Sarawak to-day enjoys the distinction of being a country where the interests of the natives are guarded with greater care than those of "the minority of superior race." Resting on the good-will of the natives and their uplift, the government of the two white Rajas has been remarkably successful. The Dutch, with their much larger possessions, in a similar way have invoked the co-operation of the native chiefs. Their government is also largely paternal, which is the form best suited to the circumstances. The Malay Sultans maintain power under Dutch control and receive their income from the government, which has abolished many abuses. As for the pagan tribes, they are treated with admirable justice. Well administered by Europeans as Borneo undoubtedly is, the question may well arise as to whether the natives are not becoming sufficiently civilised to render purposeless expeditions to study them. To this may be answered that in a country so vast, where white men are comparatively few in number, the aborigines in the more remote part are still very little affected by outside influence. The geographical features are an important factor here. In the immense extent of forest vegetation which covers the land from the sea to the tops of the mountains, the rivers are the only highways, and in their upper courses, on account of rapids and waterfalls, travel is difficult and often dangerous. Although in the last quarter of a century much has been accomplished by ethnology, still for years to come Borneo, especially the Dutch part of it, will remain a prolific field for research. The tribes are difficult to classify, and in Dutch Borneo undoubtedly additional groups are to be found. The Muruts in the north, who use irrigation in their rice culture and show physical differences from the others, are still little known. Many tribes in Dutch Borneo have never been studied. So recently as 1913 Mr. Harry C. Raven, an American zoological collector, in crossing the peninsula that springs forth on the east coast about 1° N.L., came across natives, of the Basap tribe, who had not before been in contact with whites. The problem of the Indonesians is far from solved, nor is it known who the original inhabitants of Borneo were, Negritos or others, and what role, if any, the ancestors of the Polynesians played remains to be discovered.