PLATE VIII. 



'At- 





Fig. 1. 



Digging clay with a steam shovel. Sayreville. 



. 



*%' ' i 



Fig. 2. 



H. Maurer & Son's pit, near Woodbridge. On the left a square pit, from 

 which the best grade of clay is dug ; the line of boards supports a soft, 

 water-saturated layer of sand and marks the line of a drainage ditch. 

 Wagons are removing the overburden. 



