Below the _bagani_ in rank come the warriors, a class which includes practically all the able-bodied free men; and still below them are the slaves. Slavery was an ancient institution with this people when the Spaniards first visited their country, and it has continued to flourish up to the present, in all districts a little removed from the influence of the white man. The great majority of slaves are secured by capture, but until recent years the Moro of the coast have carried on a lucrative slave trade with this tribe. Girls and women become members of their master's household, but their children are treated as slaves. Captive boys and men aid their masters in the chase and in the fields, and in most cases it would be hard indeed for a stranger to pick servant from master. Sometimes the people of a neighboring village ransom one of their fellows and in such a case the freed slave may return to his old home or he may become a free member of the community in which he has been serving. DWELLINGS The insecurity of life resulting from the conditions described has caused the people to build their homes high in the branches of trees, often so situated on the edge of cliffs that they can be approached only from one direction (Plates LXXIII-LXXIV). Two sorts of dwellings are commonly seen. Of these, the rudest rest on the limbs of trees, and conform in size and shape to the nature of the supporting branches. Some few houses of this kind have horizontal sides and sloping roofs, but more frequently a roof which slopes directly from a central ridge pole to the edges of the platform does away with the necessity of side walls. The second and more common type of house is shown in Plate LXXIV. Here the top of the tree has been cut off some fifteen or twenty feet above the ground leaving a stump to serve as a part of the foundation. Many smaller poles help support the floor and then extend upward to form the wall and roof stays. The upper flooring of beaten bark rests on cross-beams which have been lashed to the uprights. Above it are occasional horizontal poles, forming a skeleton to which the walls of _nipa_ palm are fastened. In some houses two or three of the foundation poles extend above the floor to such a height that they are used as the supports for the ridge pole. In others true king posts rest on the beams, which in turn are supported by the corner poles. From the ridge a number of smaller rods extend to or project out over the side walls, and on them rests the roofing of _nipa_ palm. A space of several inches often intervenes between the roof and the side walls. The whole structure is so firmly lashed together with rattan that it is capable of withstanding severe storms, despite the fact that it gives and creaks with every wind. During violent storms the house is further secured by anchoring it with rattan lines to nearby trees.