228 Of Change 0/"$ pecies, Chap. XIV, 



I have been credibly inform'd, that on One Perch 

 of Ground there has grown a Bufhel of Corn, which 

 is Twenty Quarters to an Acre. Mr. Houghton relates 

 Twenty -fix, and even Thirty Quarters, of Wheat on 

 One Acre. There have certainly grown Twelve Quar- 

 ters of Barley to an Acre, throughout a whole Field : 

 Therefore, unlefs a Crop exceed the lead of thefe, or 

 indeed the greateft of them (if the Relation be true), 

 a Crop cannot fail for want of Room ; for one Acre 

 (be it of what Nature it will, as to the Soil of it) 

 mull: have as much room for a Crop to grow on, as 

 any other Acre. 



Then there was room for all Dr. Woodward's 

 Three Crops together, to produce as much as Three 

 common Crops do. Yet all thefe together will fcarce 

 yield one Quarter of Corn, tho* there is room, at 

 leaft, for Twelve. 



The fame Air and Sun that had Room to do their 

 Office to Mr. Houghton's Acre, why mould they not 

 have Room to do the fame to Doctor Woodward's 

 Acre, when the Three Crops growing on it at once, 

 through pretty good ones, might require lefs Room 

 than Mr. Houghton's Crop did ? 



I perceive that thofe Authors, who explain Vege- 

 tation^ by faying the Earth imbibes certain Qualities 

 from the Air, and by fpecirk Qualities, and the like, 

 do alfo lay a great Strefs upon the perpendkidar 

 Growth of Vegetables ; feeming to fanfy there is little 

 c\(e necefTary to a good Crop, but Room. 



Mr. Bradley, in his Arguments concerning the Va- 

 lue of an Hili, does implicitly fay as much. 



But if they would but confider the Diameters of 

 the Stems, with the Meafure of the Surface of an Acre, 

 they would be convinced, that many, even of Mr. 

 Houghton's Crops, might ftand in a perpendicular 

 Pofture upon an Acre, and Room be left. 



One true Caufe of a Crop's failing, is want of a 

 Quantity of Food to maintain the Quantity of Vege- 

 tables, which the Food mould nourifh. 



