In seven instances the sculpture represents a person adoring a deity of a different theological conception in each case. One of these seems to represent the sun, another the moon, while in the remaining five it is impossible to define their character. All these deities are represented by a human figure, of which only the head, arms, and breast are correctly portrayed, proving that the religious conceptions had risen to anthropomorphism, while the idols of the nations of Central America and Mexico, which have previously come to our knowledge, are represented by disfigured human forms or grotesque images. Four of the other sculptures represent allegorical subjects; two of them the myth of the griffin, the bird of the sun. The slabs on which the low reliefs are sculptured are of various sizes; the greater number of these, like those representing the deities, are 12 feet in length, 3 feet in width, and 2 feet in thickness. Nine feet of the upper part of these stones are occupied by the sculptures, while the lower 3 feet appear to have served as a base. Several illustrations of these rock sculptures are presented, infra, as Figs. 1235 and 1236. It is evident that these very large slabs received their markings when they were in the locality in which they are now found so can be classed geographically. SECTION 2. SOUTH AMERICA. Alexander von Humboldt (_a_) gives general remarks, now condensed, upon petroglyphs in South America: