.oooT gives 825 years, the time 



J- before this fpace will 



1553 be wrought out. 



aSoo. of the County cj Northumherland. 313 



The coals exported yearly from the rivers Tyne and Wear, 

 with Hartly and B'ythe, amount to about 825,003 chaldrons, 

 which, with the home confumption of the two counties of 

 Northumberland and Durham, will make the quantity of coals 

 raifed yearly about i,coo,ooo chaldrons. 



And the chaldrons raifed yearly 1, 000,000 T gives 155 acres 



— — J" nearly per year, 



divided by the chaldrons per acre 6453 J cleared of coal 6 



yards thick. 



And, by eftimatin^ the breadth occupied by the caking coals 

 to be on an average 8 miles broad, and 25 miles long^ Jn the two 

 counties, we (hall find there will be about 230 fquare miles, or 

 128,000 acres, of coals proper for exportation. 



Then the whole area I28,c 



Divided by the yearly 

 confumption, 



But there are fome reafons to think that a thicknefs of feam, 

 equal to 6 yards, will not be obtained ever an extent of 200 

 fquare miles •, probably not more, on an average, than 4 yards 1 

 in which cafe, the coal will be exhauiled in 550 years ; And if 

 the aggregate thicknefs of the Teams to be obtained fl.ould prove 

 only 3 yards, then little more than 400 years will be the term 

 of continuance 5 but it is probable, that, before the half of that 

 time be elapfed, the price to the confumer will be confiderably 

 increafed, from the increafed expence of obtaining them, and 

 the increafed length of carriage from the pits to the river. 

 This lafl;, we prefume, may be reduced, in fome lituations, by- 

 adopting canals in ftead of waggon ways, which, we have oftea 

 wondered, have never yet been attempted. 



From the above inveftigation, it appears that Mr Williams's ap- 

 prehenfions are not fo chimerical as have been reprefented : How 

 far it might be right for the Legiflature to interfere, we leave to 

 the conlideration of thofe more converfant in political fpeculations.* 



The State of Property is elucidated in the fecond chapter; 

 and, though lefs is faid on the fuojeic than we could have 

 wilhed, yet the juft fentiments exprelTed deferve the utmoft 

 praife. The candour and difcernment of the furveyors are 

 ftrongly exemplified in the following pafTages : 



' There are probably few parts of the kingdom '.vhere eflates 

 have made fuch rapid improvements as in this country j there be- 

 ing feveral instances of the value being more than trebled within 

 the laft forty years. Manycaufes have certainly been aiding to 



produce 



