It is impossible to attempt more than an outline sketch of two or three salient features of the geology of the Yorkshire Coalfield, and any description must be something like a magazine story, “to be continued in our next.” It may be completed sometime in the next century when the eastern boundary of the Coalfield has been explored. In this respect the Yorkshire Coalfield differs from some others in this country to which the boundaries are completely traced, for instance, the Irish Coalfields are fully exposed. The boundaries of the Scotch and Northumberland Coalfields are known, except that they dip under the sea. The same remark applies to the Durham Coalfield, except the southern corner, which is covered by newer formations. The great Coalfield of Glamorgan and Monmouthshire has its boundaries well-defined, and the same may be said of the small Coalfield of the Forest of Dean. The Coalfields, however, of Somersetshire, South Gloucestershire, Staffordshire, Warwickshire, Leicestershire, Cheshire, Denbighshire, Shropshire, South West Lancashire and Cumberland are each unexplored on one side at least, and the newly-discovered Coalfield at Dover has not yet been seen by the eye of man in any part. It is therefore evident that the next century will provide plenty of work for those who explore our Coal-fields, but of all the storehouses of fuel there is none more likely to be vigorously explored than that great Coalfield which stretches from the latitude of Leeds, on the north, to the neighbourhood of Nottingham, on the south. At ...