Although the metal mines of Devonshire have lost their old importance, there are other minerals of great commercial value, of which altogether more than a million tons are obtained in the course of a year. China clay, or kaolin, a product of the natural decomposition of granite, is worked at Lee Moor, and more than 75,000 tons--which, however, is only one-tenth of that obtained from Cornwall--are annually exported, especially to Staffordshire, for the making of fine earthenware. Other kinds of potter's clay, white at Kingsteignton and Bovey Tracy, and red at Watcombe, are dug in still larger quantities. There are many quarries in Devonshire, the most important of them being of limestone, of which more than half a million tons are worked every year. Heytor granite was used in London Bridge and Waterloo Bridge, and Lundy granite in the Thames Embankment. But the stone is not considered equal to that from Cornwall. The same remark applies to the slate, of which only 5000 tons are now raised annually. There are old quarries of it near Kingsbridge, and also at Tavistock and other places. Colyton slate is used for billiard-tables. Marble is worked at Chudleigh, and a finer quality at Ipplepen, Torquay, and Plymouth. There are large quarries at Beer. The material for whetstones has long been dug in the Blackdown Hills, where the refuse from the workings, like lines of railway embankment, is a feature in the landscape. [Illustration: Stone Quarry, Beer] There is no coal in Devonshire, but there is much lignite at Bovey Tracy, where, in the bed of an ancient lake, a deposit of layers of it occurs, alternating with clay and sand, to a depth of 100 feet. On account of its disagreeable smell while burning and its low heating-power it is not used for fuel except for firing bricks, and to some extent in the pottery-kilns. There are also extensive beds of anthracite or culm near Bideford; but this, again, is not of a quality to serve as fuel, except for lime-burning, and the product of the one solitary working is ground up to make a paint called Bideford Black. There are vast and valuable deposits of peat on Dartmoor, in some places as much as thirty feet deep. 16. Fisheries and Fishing Stations. The fisheries of the British Islands form one of our most important industries, providing regular or occasional employment for nearly 100,000 men and boys in the catching of the fish; for a very great number of persons engaged in secondary occupations connected with the industry, who probably far outnumber the actual fishermen; and for innumerable people of all grades engaged in distributing the eight million pounds' worth of fish brought into the ports of England and Wales each year by British ships alone. The fisheries also furnish an immense quantity of cheap and wholesome food, which, by rapid methods of transit, is available in all parts of the country.