156 DRINKING POOLS. 7. 



4. Claying. In this operation the ma-s 

 nual art and the labour principally center. 



Upon the Wolds, cla" is fomctimes fetch- 

 ed fix or fevcn miles ; and is feklom found 

 at hand in fituations where artificial pools are 

 moll: wanted: the carriage of the clay, there- 

 fore generally, becoLJies a heavy article of ex- 

 pence. 



The choice of clay is ihou^j^nt to be lefs 

 CiTential than the working of it. Good ponds 

 are faid to have been made with common 

 loamy mould •, but ic is wrong to depend on 

 any thing but a ftrong duftile clay, if it can 

 be had within a moderate diftancc. 



The thicknefs of the coat^ now pretty gene- 

 rally laid on, is about five or fix inches in 

 the rough ; beating it down to about three 

 inches. In the infancy of the art, two coats 

 of clay, of about that thicknefs, were laid 

 on; but one coat has been found effedlual, 



and 



drun and an h;ilf of I'mc, and five fniall cart-loads of 

 fand. Both the materials were iiftcd, and worked up 

 in the ufual way into mortar. Great caution is ncccf- 

 fary in laying on the clay in this cafe. If the morta,r 

 do not lie fomc time to ftiffen, the ciay difplaces it : if 

 it get too dry before it be covered, i: is lluble to crnc^k. 



