368 DIG MARLE. [jL 



it : that they will not reap equal profit is un- 

 doubted ; but why not accept of twenty per cettt. 

 advantage ? Should they reject it, because they 

 cannot command fifty? If tenants are backv. 

 in making use of marie on lands of ten or t\\< 

 shillings an acre, their landlords should set them 

 the example, and shew that the work will answer 

 well. 



Marie is of various sorts, and lies in various 

 strata : in some places, it is a soft, fat, soapy sub- 

 stance ; in others, it is hard as chalk, which are 

 called stone-marles : sometimes you find it white, 

 sometimes grey ; also blue, yellow, and a dark 

 brown. In some counties you have shell -marie, 

 which is composed of nothing but decayed shells 

 The depths at which it lies are various : sometir 

 only three feet from the surface, at others ten or 

 twelve, and in some places so deep, that it will not 

 answer to get it at all. The strata are also of dif- 

 ferent thickness, from two feet to twelve feet dc. 

 but the general circumstances in which all trur 

 maflcs agree, and which denote them to be real, 

 are the effervescence with acids, and the falling in 

 water : the crackling in the fire is a good sign, 1 

 not alone determinate. 



If it is uncertain what strata are under a farm, 

 it is ever advisable to use the screw-borer, to dis- 

 cover what ?oils arc within reach. By means of 

 that instrument, you discover, at a trifling expenre. 

 if there be any marie at command. 



The best way of conveying it on to the land, 



if 



