[244] These Two are all we have in our Power; for pulverizing includes an Exposure to the Atmosphere; without which, I think, it cannot be reduced to Particles minute enough, or have their Superficies so impregnated as to become a fertile Pasture for Plants. The Experiment related by Mr. _Evelyn_ of artificial Pulveration, seems to prove such an Exposure necessary; as also the frequent turning (or incessantly agitating) that fine Dust for a Year, before the barren exhausted Earth was made rich and prolific; For, besides the Benefit of Pulveration and Impregnation, Land is more enriched in proportion to the Time of Exposure, during which it is free from Exhaustion, and continually receiving from the Atmosphere: Therefore frequent Turning and Exposure are both contained in the Words _pulverize_, _and not exhaust_; and to comply with the latter, we should endeavour, that our Land may be never exhausted by any other Plants than by those we would propagate, and by no more of them neither, than what are necessary for producing a reasonable Crop; which, upon full Trial, will be found a very small Number in companion to those that are commonly sown; and then, if the Supply from the Atmosphere by Help of the Pulveration exceeds the Exhaustion, the Land will become richer, tho’ constant Crops are produced of the same Species; as in the Vineyards; and the Soil of these is so much improved by a bare competent Exhaustion, and the usual Pulveration, that after producing good annual Crops without Dung, until Age has killed the Vines, they leave the Soil better than they found it; and better than contiguous Land of the same Sort kept in arable Field-culture.