Explanation of Pl. XIII. 



Fig. i. Grooved Diorite Axe from Shantung Province, in British Museum, 

 London. 



Fig. 2. Grooved Quartz Axe from India, in British Museum, London. After 

 Rivett-Carnac. 



Fig. 3. Grooved Stone Hammer from Saghalin. After Iijima. 



Fig. 4. Grooved Stone Hammer of the Chukchi. After Bogoras. 



