on the State of the Collieries at and near Nailsea. 325 



which is the case in all other situations where collieries are 

 worked to very great dcpihs. I merely mention these cir- 

 cumstances, on account of the above engine being heavily 

 laden with water, at the depth of 50 fathoms only, and to 

 show that it is no uncommon case. When other collieries 

 are open on the same vein to the westward, viz. on Nailsea 

 and Kenn Moors, they will partake of this colliery water, 

 which seems to follow a particular stratum of very hard 

 jointy rock. 



As to White's Colliery, which lies to the north and north- 

 east of Messrs. Grace's Colliery, at Nailsea; the veins which 

 are known here, break out to the north of the Nailsea Col- 

 l.iery, and naturally lay perpendicularly under the same. 

 The following are the number and thickness of the veins, 

 with the depth to which they have been sunk down and 

 worked. 



[Vide White's Colliery, in annexed Section No. 2;] where 

 the thicknesses are as follows, viz. 



1st, King's- hill vein 2 feet 



2d, Main vein 3^ 



3d, Dungey vein 2 



7-| feet, in all. 

 As to Backwell Colliery, [vide No, 3, in annexed Section,] 

 the property of Mr.Tea2;ue, partly his own estate, and partly 

 that of the Marquis of Bath; the thicknesses are as follows, 

 viz. 1st, Vein (of Smith's coal) . yi f§et 



2d, Vein 3 



3d, Dillo li 



4th, Ditto 3 



5th, Ditto 2 



12 feet, in all. 

 As to the veins of coal which lie parallel one under the 

 other in a limestone basin, (which is the case with all the 

 veins of coal in the coal countries that I am acquainted 

 with*,) [vide annexed Section No. 4 ; where G. W. and T. 

 show the places of the supposed southern crops of Grace's, 

 White's, and Teague's veins, respectively.] 



* This gentleman, in she year 1$0G, communicated to tlie Royal Socitty 

 a most interesting inap ai;d account of the great coal-f c'.d in South Wales, 

 lyinjj there in a limestone ba^in, which are printed in the Philosophical 

 Transactions of thit year: from what I have since read of Coal-fields, in 

 Williams's " iVIineial KiuKdom,"Westgnrth Forster's "Treatise on a Section 

 of Strata," Farcy's " Derbyshire Report,'" vol. i. &c. I a ii ihclincd. however, 

 to think, that some at l^ist of the coal-fiekls in the mi'dleand north-eastern 

 parts of the island, do /t ao;rei" with those of the v,-eilern side of it, to which 

 Mr. Martin here alludes, in bassetiug on ail sides from out of a litnestanc 

 |):)»in. — iLditur. 



X3 This 



