168 PICTURE-WRITING OF THE AMERICAN INDIANS. 
It may safely be assumed that the caves as abodes of spirits were sacred, but did 
not serve as places of burial. The lead rings and pieces of copper gongs found in 
Fig. 134.—Petroglyphs in Kei islands. 
small number before some of the cayes seem to be derived from sacrifices offered to 
the spirits. At the present day no more sacrifices are offered there, and the islanders 
knew nothing of the existence of these things. 
