40 Of Tillage. Chap. V, 



to enrich it •, as when the poor, hollow, thin Downs 

 have their upper Part (which is the beft) burnt, 

 whereby all, (except a Caput Mortuum) is carried 

 away ; yet the Salts of this fpread upon that barren 

 Part of the Staple, which is unburnt, divide it into 

 fo very minute Particles, that their Pafture will nou- 

 rifh two or three good Crops of Corn : But then the 

 Plough, even with a confiderable Quantity of Dung, 

 is never able afterwards to make a J3ivifion equal to 

 what thofe Salts have done -> and therefore fuch burnt 

 Land remains barren. 



Artificial Pores cannot be too fmall, becaufe Roots 

 may the more eafily enter the Soil that has them, quite 

 contrary to natural Pores •, for thefe may be, and ge- 

 nerally are, too fmall, and too hard for the Entrance 

 of all weak Roots, and for the free Entrance of ftrong 

 Roots. 



Inefficient Tillage leaves ftrong Land with its na- 

 tural Pores too fmall, and its artificial ones too large. 

 It leaves Light-land, with its natural and artificial 

 Pores both too large. 



Pores that are too fmall in hard Ground, will pot 

 eafily permit Roots to enter them. 



Pores that are too large in any Sort of Land, can 

 be of little other Ufe to Roots, but only to give them 

 PaiTage to other Cavities more proper for them ; and 

 if in any Place they lie open to the Air, they are dry'd 

 up, and fpoil'd, before they reach them. 



much ftronger than before ; and considering that 'tis tilPd with 

 lefs Expence than very ftrong Land, it is, for feveral Sorts of 

 Corn, found to be more profitable than Land of greater Strength 

 and Richnefs, that is inoie difficult to be tili'd. 



And I am apt to think, that this Sort of Light-land acquires 

 more Cement, by having its external Superficies often changed, 

 and expofed to the Dews, and other Benefits of the Atmofphere, 

 as well as by the Increafe of (its internal Superficies, which is the 

 Surfaces of all the divided Parts of Earth, or) the Failure of 

 Plants; the one being augmented by the other; i.e, that into 

 the more Parts the Earth is broken, the more Cement will it 

 attain, from the Sulphur, which is brought by the Dews. 



For 





