Note 209 — CHAP. XIV. Of Change of Species.

And cæteris paribus; for when the Land has been more exhausted, more Tillage (or Dung) or Rest will be required to produce the same Quantity of Food, than when the Land hath been less exhausted. By Tillage is here meant, not only the Number of Plowings, but the Degree of Division or Pulveration of the Soil; or, if perchance the Soil is extraordinary much exhausted by many Crops, without proper Tillage between them, the greater Degree of Pulveration, by Plowing or Dung (which is only a Succedaneum of Tillage), and also a longer Time of Exposure, may be necessary to counterpoise that extraordinary Exhaustion.