3° 



DAVENPORT ACADEMY OF NATURAL SCIENCES. 



less marked, but evident, relation between other members of both 

 series. This resemblance is restricted to form, the inscriptions on the 

 Arkansas stone being, with few exceptions, of greater length, width, 

 and depth. It is probable, however, that both series are resultant from 



the same cause, and owe their origin to the work of Mound Builders. 

 The near vicinity of this rock is very prolific in relics and other inci- 

 dental indications of populous villages of Mound Builders, whose selec- 

 tion of this individual rock as a grindstone was due to its being the 

 only exposure of rock of easy access having good abrading qualities; 



