In the strata of the same nation I found also copper battle-axes, lances, arrows, knives, and implements of different kinds, as well as a number of moulds of schist and chlorite slate for casting these and many other objects, some being of forms quite unknown to me. Seals of terra-cotta, with crosses and other ornaments, are not peculiar to these strata, but occur also at a depth of from 33 feet as far up as 1¾ feet below the surface. We have also brought to light hand mill-stones of lava, which are oval on one side and flat on the other, and some also of granite; large and small hammers, axes, and balls with a hole through the centre; further, mortars and pestles of diorite, and weights of granite; quoits made of granite and other kinds of stone, with a hole through the centre for throwing them. Sling-bullets made of loadstone, and great quantities of knives made of white or yellow silex in the form of saws, sometimes also knives of volcanic glass and lances of diorite are met with among the ruins of this people, but all these instruments are much better finished than in the strata above a depth of 7 meters (23 feet).
