The same "medicines," the same dances, the same enchantments used in the black art, are used in the professedly innocent white art; the chief difference being in the mission that the utilized spirit is entrusted to perform. Similarity in witchcraft practices is one of the several grounds held by ethnologists, as proving identity in origin of the African Negro and the Australian black. To quote from Dr. Carl Lumholtz's book, "Among Cannibals": "In the various [Australian] tribes are so-called wizards, who pretend to communicate with the spirits of the dead and get information from them. They are able to produce sickness or death whenever they please, and they can produce or stop rain and many other things. Hence these wizards are greatly feared. Attention is called to the influence of this fear of witchcraft upon the character and customs of the natives. It makes them bloodthirsty, and at the same time darkens and embitters their existence. An Australian native is unable to conceive death as natural except as the result of an accident or of old age; while diseases and plagues are always ascribed to witchcraft and to hostile blacks. In order to practise his arts against any black man, the wizard must be in possession of some article that has belonged to him. On Herbert River the natives need only to know the name of the person in question, and for this reason they rarely use their proper names in addressing or speaking of each other, but simply their class names. I once met a black man who told me that he personally had been the victim of strange wizards, and that ever since that time he had been a sufferer from headache. One afternoon many years ago, two wizards had captured and bound him; they had taken out his entrails and put in grass instead, and had let him lie in this condition till sunrise. Then he suddenly recovered his senses and became tolerably well; a result for which he was indebted to a wizard of his own tribe, who thus proved himself more powerful than the two strangers. The blacks call an operation of this kind kobi, and a man who is able to perform it, as a matter of course, is very much respected and feared." "The Ovimbundu race," says Arnot, "of Bihe and the country to the west are most enterprising traders and imitators of the Portuguese. They seem, however, to retain tenaciously their superstitions and fetich worship.