Very important distinctions-those of caking or non-caking-are founded on the behaviour of coals when subjected to the process of coking.
In some instances the coal seams may be changed as a whole, as for instance in South Wales, where the coking coals of the eastern side of the basin pass through the state of dry steam coal in the centre, and become anthracite in the western side.
The coal deposits of Washington are the only important ones in the Pacific states, and in Washington only, of the Pacific states, is there any coking coal.
The coal underlying the east half of the state, the " Great Plains," is lignitic and of inferior quality, but that in the mountain districts is bituminous and generally suitable for coking.
Trinidad has railway shops, foundry and machine shops, and coking ovens, ships large quantities of coal, has a woolscouring mill, and various manufactures.
