Note 1829 — Chapter VI · (continued 3)

Rau is an authority on stone implements. See further his paper on stone implements in the Smithsonian Rept., 1872; one on drilling stone without metal in Ibid. 1868; and one on cup-shaped and other lapidarian sculpture in the Contributions to No. Amer. Ethnology, vol. v. (Powell’s Rocky Mountain Survey, 1882). These carved, cup-like cavities in rocks are also discussed in Wilson’s Prehistoric Man, vol. i. ch. 3, where it is held that they were formed by the grinding process in shaping the rounded end of tools. H. W. Henshaw in the Amer. Jour. of Archæology (i. 105) discusses another enigma in the stone relics, called sinkers or plummets. Foster (Prehist. Races, 230) believes they were used as weights to keep the thread taut in weaving.