FEW realise the important role played by clay in the industries. It certainly ranks not lower than fourth in the value of its production in the mineral industries of the world, and it is only exceeded by iron and coal, and possibly copper. Very few industries, too, are not dependent in some way upon clay products. Every advance in the quality of these products has been followed by advances in other industries. The raising of the refractory qualities of fire-bricks, for example, gives the metallurgist greater power and scope, and the success of the electrochemical industries is to a large extent dependent upon the capability of the potter. History of the Clayworking Industry in the United States. By Dr. H. Ries H. Leighton. Pp. ix + 270. (New York: John Wiley and Sons; London: Chapman and Hall, Ltd., 1909.) Price 10s. 6d. net.