OF MANURE. 203 



is much more in use than marie, and hardly any observa- 

 tions have been transmitted to me regarding this branch of 

 the enquiry. One intelligent correspondent, (Captain John 

 Henderson), recommends it as a good mode, to apply it 

 upon the hay-stubble, after the first crop; if the marie is 

 thus used, the land should be pastured the next season, and 

 afterwards ploughed down either for oats, or for wheat, 

 in districts where that grain thrives. At any rate, it should 

 be allowed to batter on the surface, previous to its being 

 ploughed down, to prevent its falling down to the bottom 

 of the furrow, as the land falls from the plough. Dr Co- 

 ventry remarks, that the value of most marles, is nearly in 

 proportion to the quantity of lime, or calcareous earth, in 

 their composition, taken in conjunction with their distribu- 

 tability, or the ease and completeness with which they may 

 be mixed with the soil. Hence it happens, that though 

 nine tons of the carbonate of lime in marie, would be much 

 the same with six tons of unmixed lime, yet the impure 

 marie, when fully broken, being more distributable than 

 lime, especially if it be imperfectly slacked or at all clotted, 

 perhaps a quantity of that marie, containing seven tons of 

 the carbonate of lime, may be of equal value, as a manure, 

 with the other the six tons of lime. Clay marles, how- 

 ever, are often very weak and impure; hence it often re- 

 quires sixty, and, in some cases, even eighty tons of marie, 

 to supply seven or eight tons of the carbonate of lime. 

 Where that happens, lime itself is undoubtedly, in many 

 respects, the cheaper and preferable article. 



5. Sea-ware. The importance of this manure, when it 

 can be had near at hand, and in considerable quantities, 

 is very great. It is calculated, that land possessing this 

 advantage, is worth more rent, to the amount of from 10s. 

 t*> even 15s. per acre, for the land that possesses it. Tan- 



