[The Igorots’ Method.] The present mining district acquired by the society mentioned, the Sociedad Minero-metalurgica Cantabrofilipina de Mancayan, was divided amongst the Igorots into larger or smaller parcels strictly according to the number of the population of the adjacent villages, whose boundaries were jealously watched; and the possessions of each separate village were again divided between certain families; whence it is that those mountain districts exhibit, at the present day, the appearance of a honeycomb.  To obtain the ore, they made cavities, in which they lighted fires in suitable spots, for the purpose of breaking the rock into pieces by means of the elasticity of the heated water contained in the crevices, with the additional assistance of iron implements.  The first breaking-up of the ore was done in the stream-work itself, and the dead heaps lay piled up on the ground, so that, in subsequent fires, the flame of the pieces of wood always reached the summit; and by reason of the quality of the rock, and the imperfection of the mode of procedure, very considerable down-falls frequently occurred.  The ores were divided into rich and quartziferous; the former not being again melted, but the latter being subjected to a powerful and persistent roasting, during which, after a part of the sulphur, antimony, and arsenic had been exhaled, a kind of distillation of sulphate of copper and sulphate of iron took place, which appeared as “stone,” or in balls on the surface of the quartz, and could be easily detached. [135]

[The Smelter.] The furnace or smelting apparatus consisted of a round hollow in clayey gound, thirty centimeters in diameter and fifteen deep; with which was connected a conical funnel of fire-proof stone, inclined at an angle of 30 deg., carrying up two bamboo-canes, which were fitted into the lower ends of two notched pine-stems; in these two slips, covered all over with dry grass or feathers, moved alternately up and down, and produced the current required for the smelting.

[Smelting.] When the Igorots obtained black copper or native copper by blasting, they prevented loss (by oxidation) by setting up a crucible of good fire-proof clay in the form of a still; by which means it was easier for them to pour the metal into the forms which it would acquire from the same clay.  The furnace being arranged, they supplied it with from eighteen to twenty kilograms of rich or roasted ore, which, according to the repeated experiments of Hernandez, contained twenty per cent of copper; and they proceeded quite scientifically, always exposing the ore at the mouth of the funnel, and consequently to the air-drafts, and placing the coals at the sides of the furnace, which consisted of loose stones piled one over another to the height of fifty centimeters.  The fire having been kindled and the blowing apparatus, already described, in operation, thick clouds of white, yellow, and orange-yellow smoke were evolved from the partial