I will terminate my remarks by mentioning another custom which also is a source of most erroneous conclusions. I mean the practice of blood-revenge. All savages are under the impression that blood shed must be revenged by blood. If any one has been killed, the murderer must die; if any one has been wounded, the aggressor's blood must be shed. There is no exception to the rule, not even for animals; so the hunter's blood is shed on his return to the village when he has shed the blood of an animal. That is the savages' conception of justice--a conception which yet prevails in Western Europe as regards murder. Now, when both the offender and the offended belong to the same tribe, the tribe and the offended person settle the affair.(39) But when the offender belongs to another tribe, and that tribe, for one reason or another, refuses a compensation, then the offended tribe decides to take the revenge itself. Primitive folk so much consider every one's acts as a tribal affair, dependent upon tribal approval, that they easily think the clan responsible for every one's acts. Therefore, the due revenge may be taken upon any member of the offender's clan or relatives.(40) It may often happen, however, that the retaliation goes further than the offence. In trying to inflict a wound, they may kill the offender, or wound him more than they intended to do, and this becomes a cause for a new feud, so that the primitive legislators were careful in requiring the retaliation to be limited to an eye for an eye, a tooth for a tooth, and blood for blood.(41) It is remarkable, however, that with most primitive folk like feuds are infinitely rarer than might be expected; though with some of them they may attain abnormal proportions, especially with mountaineers who have been driven to the highlands by foreign invaders, such as the mountaineers of Caucasia, and especially those of Borneo--the Dayaks. With the Dayaks--we were told lately--the feuds had gone so far that a young man could neither marry nor be proclaimed of age before he had secured the head of an enemy. This horrid practice was fully described in a modern English work.(42) It appears, however, that this affirmation was a gross exaggeration. Moreover, Dayak "head-hunting" takes quite another aspect when we learn that the supposed "headhunter" is not actuated at all by personal passion. He acts under what he considers as a moral obligation towards his tribe, just as the European judge who, in obedience to the same, evidently wrong, principle of "blood for blood," hands over the condemned murderer to the hangman. Both the Dayak and the judge would even feel remorse if sympathy moved them to spare the murderer. That is why the Dayaks, apart from the murders they commit when actuated by their conception of justice, are depicted, by all those who know them, as a most sympathetic people. Thus Carl Bock, the same author who has given such a terrible picture of head-hunting, writes: