814 



CLAY 



Silica 



Alumina .... 



Oxide of iron 



Magnesia .... 



Soda 



Water and organic matter . 



3. Clay making good red bricks : 



Silica .... 

 Alumina and oxide of iron 

 Carbonate of lime . 



magnesia . 



Water, &c. . 



i 



50-35 



23-50 



10-40 



1-46 



1-55 



11-15 



99-10 



n 



56-90 



24-90 



2-83 



1-07 



3-00 



11-60 



100-30 



in 



54-80 



27-60 



2-66 



1-00 



2-00 



11-80 



99-76 



60-40 



24-00 



2-70 



1-30 



21-60 



100-00 



4. Clay inferior, on account of excess of carbonate of lime ; effervesced strongly with 

 acids : 



Silica 33-06 



Oxide of iron and alumina 1 1 -20 



Carbonate of lime . 39-80 



magnesia ..*... 6-00 



Water. &c. . 10-00 



100-06 



48-75 

 17-95 

 15-70 

 2-32 

 1-50 

 13-35 



99-57 

 The production of the finer kinds of clay was as follows, in the years given : 



6. Black shale from coal-measures, Dudley : 



Silica . 

 Alumina . 

 Oxide of iron. 

 Lime 



Magnesia . 

 Water, &c. . 



Production in 1865 

 Do. 1866 



Do. 1867 



Do. 1868 



Production in 1865 

 Do. 1866 



Do. 1867 



Do. 1868 



CoBNWAiL. 



KAOLIN, commonly called China Clay. 



Tons 



. 97,750 

 . 105,000 

 . 127,000 

 . 100,000 



Production in 1869 

 Do. 1870 



Do. 1871 

 Do. 1872 



China Stone. 

 Tons 

 25,500 

 36,000 

 33,500 

 29,000 



Production in 1869 

 Do. 1870 



Do. 1871 



Do. 1872 



Shipments in 1872 of China Clay and China Stone. 



Tons 

 105,700 

 110,520 

 125,000 



Tons 

 28,500 

 32,500 

 33,000 



Tons 



Sent on by Railway 954 



