tes_,
by P. Roberts, was published in 1901.

The most useful general work on coal mining is the _Text Book of Coal
Mining_, by H. W. Hughes, which also contains detailed
bibliographical lists for each division of the text. The 5th edition
appeared in 1904.

Current progress in mining and other matters connected with coal can
best be followed by consulting the abstracts and bibliographical lists
of memoirs on these subjects that have appeared in the technical
journals of the world contained in the _Journal_ of the Institute of
Mining Engineers and that of the Iron and Steel Institute. The latter
appears at half-yearly intervals and includes notices of publications
up to about two or three months before the date of its publication.
(H. B.)

COALBROOKDALE, a town and district in the Wellington parliamentary
division of Shropshire, England. The town has a station on the Great
Western railway, 160 m. N.W. from London. The district or dale is the
narrow and picturesque valley of a stream rising near the Wrekin and
following a course of some 8 m. in a south-easterly direction to the
Severn. Great ironworks occupy it. They were founded in 1709 by Abraham
Darby with the assistance of Dutch workmen, and continued by his son and
descendants. Father and son had a great share in the discovery and
elaboration of the use of pit-coal for making iron, which revolutionized
and saved the English iron trade. The father hardly witnessed the
benefits of the enterprise, but the son was fully rewarded. It is
recorded that he watched the experimental filling of the furnace
ceaselessly for six days and nights, and that, just as fatigue was
overcoming him, he saw the molten metal issuing, and knew that the
experiment had succeeded.

The third Abraham Darby built the famous Coalbrookdale iron bridge over
the Severn, which gives name to the neighbouring town of Ironbridge,
which with a portion of Coalbrookdale is in the parish of Madeley
(q.v.). Fine wrought iron work is produced, and the school of art is
well known. There are also brick and tile works.

COAL-FISH (_Gadus virens_), also called green cod, black pollack, saith
and sillock, a fish of the family _Gadidae_. It has a very wide range,
which nearly coincides with that of the cod, although of a somewhat more
southern character, as it extends to both east and west coasts of the
North Atlantic, and is occasionally found in the Mediterranean. It