In the case of a man who seeks to become wealthy in trade and goes to a magic doctor for that purpose, the doctor tells him of the different kinds of medicine, and some of the most important things required for each. The seeker may choose what he is able and willing to do. For Okundu medicine it is required that the seeker shall name some one or more of his relatives who he is willing should die, and that their spirits be sent to influence white traders or other persons of wealth, and make them favorably disposed toward the seeker, so that they may employ him in positions of honor and profit. If the seeker hesitate to do the actual murder, the doctor, by his black art, is to kill the person nominated and send him on his errand. If the fear should occur to the seeker that perhaps the murdered relative, instead of devoting himself in the spirit-world to the trade interests of his murderer, should attempt to avenge himself, the subject is dismissed by the doctor's assurance that either the spirit shall not know that the death of its body was premature, or that he will overrule it for the desired purpose. I know, personally, a Mpongwe man still living in Gabun who is believed to have done this Okundu. He is of prominent family, and had held lucrative service with white traders. His fortunes began to wane; he fell into debt, and white men began to doubt him and hesitated to entrust him. Though wearing the dress of a civilized gentleman, he is a heathen at heart. He had a little slave boy. The child suddenly and mysteriously disappeared. Those who asked questions received evasive and contradictory answers. A very reliable native told me that it was known that this man had been communicating with an Okundu doctor, and many believed that the child had been put to death. But no one dared to say anything openly, and there was not sufficient proof on which to lay an information before the French governor, only a mile distant. Another Mpongwe trade medicine is Mbumbu (which means "rainbow"). Old tradition said that the rainbow was caused by a forest vine which a great snake had changed to the form of the sun-colored arc. The seeker of wealth is aided by the doctor to obtain a piece of this rainbow, which he keeps in secret, and can carry hidden with him. By it he is able at any time to kill any one of his relatives whom he may choose (of course unknown to them) and send their spirits off to induce foreign traders to give him a store of goods (the children's pot of gold at the rainbow's end?). _For Sickness._ Among the Mpongwe and adjacent tribes there are three kinds of spirits invoked, according to the character of the disease. These are Nkinda, Ombwiri, and Olâgâ.