BUREAU OF AMERICAN ETHNOLOGY 



BULLETIN 52 PLATE 12 



PEBBLE NUCLEI 



(Actual size) 



Forms rcsultiiiL' from attempts to produce (lakes of a size suitable for use as implements: b, c, d. i,j, 

 from the Hrdlidka Argentine collection; a, e, f, g, h, k, made by W. H. Holmes from Washington 

 pebbles. 



