Chap. XIV. Of Change df S pe ci e i 231 



Tillage will produce the fame Quantity of Food in - 

 the fame Land (a) ; and that the fame Quantity of 

 Food will maintain the fame Quantity of Vegetables. 



a Tis ken, that the fame Sort of Weeds, which 

 once come naturally in a Soil, if fuffer'd to grow, 

 will always profper in proportion to the Tillage and 

 Manure beftow'd upon it, without any Change. And 

 fo are all manner of Plants, that have been yet try'd 

 by the new Hufbandry, feen to do. 



A Vineyard, if not tilled, will foon decay, even 

 in rich Ground, as may be feen in thofe in France \ 

 lying intermingled as our Lands do in common Fields. 

 Thofe Lands of Vines, which by reafon of fome 

 Law-fuit depending about the Property of them, or 

 otherwife, lie a Year or two untilled, produce no 

 Grapes, fend out no Shoots hardly : the Leaves look 

 yellow, and feem dead, in Comparifon of thofe on 

 each Side of them; which, being tilled, are full of 

 Fruit, fend out an hundred times more Wood, and 

 their Leaves are large and fiourifhing •, and continue 

 to do the fame annually for Ages, if the Plough or 

 Hoe do not neglect them. 



No Change of Sorts is needful in them, if the fame 

 annual Quantity of Tillage (which appears to provide 

 the fame annual Quantity ofFood) be continued to the 

 Vines. 



But what in the Vineyards proves this Thefis moil 

 fully is, That where they conitantly till the low Vines 



(a) And ceteris paribus ; for when the Land has been more 

 exhaufted, more Tillage (or Dung) or Reft will be required to 

 produce the fame Quantity of Food, than when the Land hath 

 been lefs exhaufted. By Tillage is here meant, not only the 

 Number of Plowings, but the Degree of Divifionor Pulveration 

 of the Soil ; or, if perchance the Soil is extraordinary much ex- 

 haufted by many Crops, without proper Tillage between them, 

 the greater Degree of Pulveration, by Plowing or Dung (which 

 is only a Succeda?:eum of Tillage), and alfo a longer Time of Ex- 

 pofure, may be neceftary to counterpoife that extraordinary Ex- 

 hauftion. 



QL 4 with 



