EXPLANATION OF PLATE IX. 



Groovod pebbles, probal)ly used as haiiimoi's or as club heads. 

 Found with other stone relics, in auriferous g-ravel, 10 fe'^t beneath 

 the surface, on Indian Gulch, near Spanish Flat, Eldorado County, 

 Cal. Objects of this general character have a wide range geograph- 

 ically and served various purposes in the economy of savage and bar- 

 barian life. The upper specimen is of horn}»lende andesite and the 

 lower of fine-grained diorite. Referred to by Whitne}', p. 276. No. 

 21, a, b, Vo}^ collection. 



440 



