In the same way a murderer receives no punishment if his act is one of vengeance for a similar crime. He is exacting the price of blood, and the blood-feud is recognized and approved. It is highly meritorious to kill a foreigner or a public enemy, and the slayer becomes ipso facto a popular hero.

This conception of morality is the production of tradition and has been influenced in various ways by the jurisdiction of the Sorcerers over a number of offences, especially those relating to sex and ritual.

It has long been popularly supposed that races in a rudimentary stage of civilization enjoy absolute immunity from regulation in the matter of sexual relations. Nothing could be further from the truth, the evidence all pointing the other way. Indeed, paradoxical as it may seem, it is none the less true that sexual relations of primitive peoples are more restricted, more bound round by various interdictions, than those of peoples which have reached a higher stage of development. It is plain that we have often confused complete sexual licence with the exercise of perfectly limited and defined rights which are only permitted during certain public festivals. It is only necessary in this connection to remind ourselves of the Saturnalia in Rome.

The same error appears in the popular attitude towards polyandry, which is frequently attributed to the moral abandonment of the women. In reality the system is no less organized and regulated than that of polygamy. Further, all educated travellers who have lived long enough among primitive races to attain some degree of intimacy have expressed surprise at their reticence in speaking of these matters. They display the most marked repugnance to give any information about their women, and if pressed to answer questions, take refuge in evasion or refuse to continue the conversation.

It is only after years spent amongst them, and, after winning their confidence, mainly by medical services, that a European can penetrate at all into that region of mystery from which he is jealously excluded.

Some of the following observations are the result of personal investigation. Others are made on the authority of several of my countrymen with the experience of a long residence in the country behind them, while others again are founded on information supplied by the natives which I have myself verified. Some of my remarks apply only to a tribe or a particular region, but in many cases they hold good of the whole group, and even of a wider circle, for it must never be forgotten that resemblances are encountered everywhere between the customs of these folk and those, not only of other peoples of the Far East, but also of the semi-savages of Africa and Polynesia.

I have had occasion to speak before of the custom, practised by several of the Moï tribes, of killing the firstborn if no one comes forward to claim the paternity. Thanks to this convenient institution, it is quite usual for a young girl to become a mother solely to prove her fertility.

We find this same custom among the Bohindu of the Belgian Congo, where the girls indulge in promiscuous prostitution until conception takes place. This event guarantees them a husband, for sterility is a ground for divorce, and the man looks upon fertility as the highest virtue in a woman. Thus, calculated prostitution, if I may use the phrase, is not regarded with disfavour by some primitive peoples. Where the motive is other than the desire for maternity it is regarded merely as mental aberration or weakness of mind. If a woman gives herself without love, she is not a criminal but an idiot. The same attitude is displayed by the Abahua of the Belgian Congo. Each time that we made the acquaintance of a Moï tribe the Chief was careful to demonstrate his hospitality by the offer of some female slaves instructed to put themselves at our disposal. It seems that this act of courtesy is invariably extended to strangers of their own race, and consequently their astonishment was all the greater when we declined the honour.