Chap. XIV. Of Change of S? ec ie s. 233 



Clover (a), or St. Foin : I found the true Caufe of 

 this Exception to that Rule to be chiefly the differ- 

 ent Tillage (b). 



Land muft be well tilled for Turneps, which alfo 

 are commonly hoed ; they (land fcarce ever above 

 Three-quarters of a Year, and are then fed on the 

 Ground; and then the fucceeding Crop of Corn has, 

 by that means, the Benefit of twice as much Tillage 

 from the Hoe, as otherwife would be given to it ; 

 and the Broad Clover, or St. Foin, fown with the 

 Corn (if the Corn be notfo big as to kill it), will en- 

 joy, in its Turn, a Proportion of the extraordinary 

 Tillage, and of the Dung of Cattle, which feed the 

 Turneps, and thrive accordingly: But Broad Clover 

 and St. Foin, being perennial Plants, Hand on the 

 Ground fo long, that it lies feveral Years untilled ; 

 io that Turneps, fown immediately after thefe, do 

 fail, for want of their due Tillage, for which there 

 is not fulBcient time, by plowing often enough •, be- 

 caufe, by the common Ploughs, it requires Two or 

 Three Years to make it fine enough for Turneps, or 

 for a Repetition of Clover, or St. Foin, in ftrong or 

 fwerdy Land. 



Another Reafon why any Crop fucceeds well after 

 Turneps (and befides their being fpent on the Ground 

 where they grow) is their cold Conftitution, by which 

 they are maintained with lefs Food than another Plant 

 of the fame Bulk. 



The Parenchyma, or flefhy Part of a Turnep, con- 

 fiding of a watry Subftance, which cools the VefTels, 

 whereby the Sap's Motion is very flow, in propor- 

 tion to the very low Degree of Heat it has, and 



(a) But when Clover has been fed by Cattle, the Ground being 

 good, and well tilled, Turneps may thrive immediately after Clo- 

 ver : Therefore this is an Exception to the general Rule. 



< b) \ ery mellow rich Land is fo full of vegetable Food, that 

 *ti$ an Exception to moft Rules ; and therefore I fpeak not of 

 that. 



fends 



