A year does not elapse without their undertaking campaigns against, and making prisoners of the Guatos, Cayapos, Bororos, Xiquitos, Chamococos, (the two last are of the province of St. Cruz de la Sierra,) Guaxis, who dwell about the heads of the Aranhahy, Coroas, Caiavabas, Guannas, and other tribes. The Guannas are the most numerous, and amongst them alone is remarked the cultivation of some hortulans and cotton trees. They content themselves with one wife; but the law is free to both parties to effect a separation, and contract a new alliance, when one is disgusted with the other; such separations, however, are very rare. The ceremony of marriage consists in a plentiful banquet, accompanied with a rude dance. They have a general cemetery, which is a large open structure covered with mats, where each family has a part staked off for its use. Above the sepulchres of the men are deposited their bows, arrows, and other arms. Those of distinguished warriors are decked with ornaments. Rich young females are decorated as if for the bridal day. They have no religion; and, in place of doctors or surgeons, there are certain persons denominated _Unigenitos_, who are pretended diviners and superstitious imposters, absolutely destitute of that knowledge of medicine or cure of diseases, which belongs to other savages less distinguished. They cure their patients by smoking or sucking the part affected, and expectorating into a grave; they do not prescribe any beverages. They believe in a creator of all, but to whom they pay no kind of homage, nor have recourse upon any urgent occasions; and also an inferior spirit, endowed with the knowledge of futurity, whom they denominate _Nanigogigo_. They admit the immortality of the soul; but it would appear, they have no idea of future recompenses being proportioned to the conduct of life; they imagine that the souls of the captains and unigenitos are in a state of enjoyment after death, and that those of the people wander about the cemetery. The unigenitos acquire most credit by their pretended familiarity with the Nanigogigo, for which the people consider them privileged. The _macauhan_ is a bird which produces much auguration amongst the Guaycurus, when its notes are unintelligible to them; upon such occasions the subsequent night is a season of inconvenience and labour to the unigenitos, who occupy themselves alternately in lamentable singings, or in imitating the notes of various birds, shaking at the same time a calabash with little stones in it, and in calling upon the Nanigogigo to interpret the mysterious song of the bird. They practise the same artifice when they pretend to know whether an invalid will die or recover, and if good or ill success will attend an ensuing war. It is considered a beauty amongst these people to have no hair upon the eyebrows, being particularly careful to extract it on its appearing.