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CHAP, XIV. 



Of Change ^Species. 



I. Tkat Plants of the moft different Nature feed on 

 the fame Sort of Food, 



II. That there is no Plant but what mtijlrob any other 

 Plant within its Reach, 



III. That a Soil which is prefer to one Sort of Ve- 

 getable once, is, in Refpcti of the Sort cf Food it 

 gives, proper to it always, 



T F any one of thefe Three Proportions be true, as 

 j| I hope to prove all of them are, then it will fol T 

 low, that there is no need to change the Species of Ve- 

 getables from one Year to another, in refpecl to the 

 differ rent Food the fame Soil is, tho'faifely, fjppofed 

 to yield (a). 



The common Opinion is contrary to all thefe (as 

 It muft be, if contrary to any one of them) : And 

 fince an Error in this fundamental Principle of Ve- 

 getation is of very ill Confequence-, and fince Dr. 

 Woodward, who has beenferviceabie in other refpects 

 (b) to this Art, has unhappily fallen in with the VuU 

 gar in this Point; his Arguments for this Error re* 

 quire to be anfwer'd in the firft Place. 



(a) For if all Plants rob one another, it muft be becaufe they 

 all feed on the fame Sort of Food ; and, admitting they do, there 

 can be no Neccffity of changing the Species of them, from one 

 Soil to another; but the fame Quantity of the fame Food, with 

 the fame Heat and Moifture which maintains any Species one 

 Year, muft do it any other Year. 



[b) By proving, in hi& Experiments, that Earth is the Pabulum 

 of PJanfc. 



