Note 32 — CHAP. V. Of Tillage.
Reading edition
This is the most proper Trial of the Effect of Pulveration by pounding and grinding; but Land may be so barren, that Plough or Spade may not be sufficient to pulverize it to that Degree, which is necessary to give it the same Fertility, that Pounding in a Mortar, or grinding betwixt Marbles (as Colours are ground), can.