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POPULAR SCIENCE REVIEW. 
considerable falling off. With the general revival of English 
trade — whenever that may take place — no doubt this branch 
will also revive.* 
* The following’ table — compiled from Mr. Hunt’s Mineral Statistics — 
shows the variations of production (in tons) since the year 1874, when the 
largest quantities were produced : — 
China Clay 
China Stone 
Total 
1874 
1875 
1876 
1877 (estimated) 
Cornwall 
150,500 
108,250 
105,275 
100,000 
Devon 
33,309 
29,146 
25.000 
22.000 
42.500 
38.000 
34.500 
30.000 
226,309 
175,396 
164,775 
152,000 
