Smithsonian Report. 1940. -Bishop 



Plate 2 



^ v. 



r!rs:**i: — Jtkt 



1. Chinese Water Wheels, Northwestern China. 

 Similar ones occur right across Asia as far as Persia at least. 



2. CHlr^lE:^,L Grindstone, of a Form Found as Far to the West as the Mediter- 

 ranean Region. 



