Coal. 597 



70 of which are worked somewhere or other. The 

 quantity of available coal in that coalfield has been 

 estimated by Mr. Vivian and Mr. Clark at about 36,500 

 millions of tons. In the Forest of Dean at least 23 

 beds of coal occur ; and the quantity untouched and 

 still available has been stated by Mr. Dickinson to be 

 265 millions of tons. In the Bristol and Somersetshire 

 coalfields, where there are about 87 beds of work- 

 able coal, according to Mr. Prestwich, the quantity 

 of coal still available is said to be nearly 4,219 mil- 

 lions of tons. In South Staffordshire, in the south part 

 of the field, there are seven well-known beds, one of 

 them 40 feet thick, and a greater number in the 

 north ; and in Coalbrook Dale there are 18 beds, all 

 partly worked. The unexpended portions of these, 

 added to the available coals of the Forest of Wyre 

 and Glee Hill coalfields, amounts to nearly 2,000 mil- 

 lions of tons still available, as estimated by Mr. Hartley. 

 In Leicestershire there are about 30 beds of coal 

 over one foot thick, and Mr. Woodhouse states that 

 nearly 837 millions of tons are available; and in 

 Warwickshire, where five chief beds are worked, about 

 458-| millions. In Nottinghamshire, Derbyshire, and 

 Yorkshire, one large coalfield, about 19 beds are 

 worked somewhere or other in the coalfield, and, 

 according to Mr. Woodhouse, more than 18,000 

 millions of tons are still available. In North Staf- 

 fordshire, there are about 28 workable beds of well- 

 known coal, and others besides not yet worked, and it 

 is stated by Mr. Elliot that 4,826 millions of tons 

 still lie there at available depths. In Lancashire 

 and Cheshire more than 40 beds of coal over one 

 foot of thickness are known, many of them of great 

 value, and about 5,636 millions of tons according to 



