CHAPTEE V. 

 MANURES. 



RELATIONS OF SOILS TO MANURE. 



270. Some soils are so rich in all the elements of 

 fertility, that they have not yet required manuring. 



271. A few others possess such resources for a na- 

 tural re-supply of the elements of fertility, as to allow 

 us safely to predict that they never will require ma- 

 nure. 



272. Setting aside the first — those which yet pro- 

 duce well without manure — as enjoying only a tempo- 

 rary exemption from the general rule, we may dis- 

 tribute lands, according to their relations to manure, 

 into three classes : those which will produce well 

 without manure, those which will produce good crops 

 with manure, and those which will not give remune- 

 rating crops either with or without manure 



273. To the first class — those producing without 

 manure — belong : 1st, lands lying on the borders of 



