How may this remarkable fact be explained? That these tribes formerly possessed languages of their own can scarcely be doubted. For, as respects physical characteristics, they are absolutely distinct races. Considering their characteristics as a whole, moreover, it is utterly impossible that they could have lacked language before coming into contact with the peoples who entered the country at a later period. How, then, did these people come apparently to lose their original language? To this we may briefly reply that there here transpired what always occurs when the well-known principle of the struggle for existence is applied to the field of mental phenomena. The stronger race crowded out the most important mental creation of the weaker, its language. The language of the weaker race, which was probably very meagre, succumbed to a language that was more highly developed. At first glance, this explanation would appear to contradict what we know concerning the life of these primitive tribes. With what anxiety they isolate themselves from their neighbours! A striking proof of this is offered by the practice of secret barter, in which primitive man sets out from the forest, if possible by night, and deposits his captured game at a place which custom has set apart for this purpose, returning the next night to take whatever the more civilized neighbouring tribes have left in exchange--iron implements and weapons, material for clothing, and especially articles of adornment. The participants in this barter do not see each other, much less speak with each other. But where such seclusion exists, how is it possible for a strange language to penetrate? This problem appears almost insoluble. Nevertheless, a solution that appears at least probable was suggested by the investigations of Kern, an able Dutch scholar. His studies were based mainly on the development of the various Malayan idioms. A remarkable exception to the rule that primitive tribes have adopted the language of their more civilized neighbours came to light in the case of the Negritos of the Philippines. Their neighbours, as well as those of the tribes of the interior of Malacca, belong to that much-migrating race, the Malayans. If we compare the Negrito word-formations that have been collected during the past forty years with the vocabulary of the neighbouring Malayans, it is evident that all the words are entirely different, or at least seem to be so with few exceptions. When, however, Kern traced the probable development of these words, and compared them, not with the present-day usage of the Malays but with older stages of their language, he found that the latter invariably contained the counterparts of the Negrito words. Thus, while these Negritos have remained untouched by the present-day Malays, who probably entered the country at least several centuries ago, they have evidently derived their language from a Malayan influx that occurred much earlier still. To this may be added the demonstrable fact, gleaned from another source, that from very early times the Malayan tribes undertook migrations at widely separated intervals. Traversing the seas in their unsteady boats, they at various times peopled such islands, in particular, as were not too remote from the mainland. Now the testimony of language, to which we have referred, demonstrates that there were at least two such migrations to the Philippines, and that they occurred at widely different times. The original Malayan dialect, which has now become extinct or unknown to the modern Malays, was assimilated by the Negrito peoples, who probably occupied this territory before the arrival of any of the Malays. But this leads to a further inference. If the language was appropriated in prehistoric times and if the conditions of the present are such as would make this scarcely possible, we must conclude that the interrelations of the immigrants and the original inhabitants were formerly not the same as those that now prevail. And, as a matter of fact, this seems altogether probable, if we call to mind the descriptions which modern travellers give of their experiences among these primitive peoples. The traits of character that particularly distinguish them are fear and hatred of their more civilized neighbours; corresponding to this, is the contempt felt by the latter, because of their higher culture, for the more primitive peoples. The only thing that restrains the immigrant people from waging a war of extermination against the original inhabitants is the fear of the poisoned arrow which the Negrito directs against his enemy from behind an ambush. In view of these facts it is not difficult to understand the almost universal isolation of primitive man at the present time.