( i6 ) 



vegetables for their neighbours : for both air 

 and room are neceffary, in order to give full 

 efFed to their inconceivable power of vege- 

 tation. 



§ v. 



The Produce of Leaves. 



In a good land, the leaves may be plucked 

 off thefe roots every twelve or fifteen days, 

 I have remarked, more than once, that, in 

 the fpace of twenty-four hours, their leaves 

 increafe from 25 to 30 lines in length, and 

 from 18 to 20 in breadth; and alfo, that at 

 the fecond crop, they have been from 28 to 

 •30 inches in length, and from 20 to 22 in 

 breadth. This account will appear exagge- 

 rated, till experience ftiall have demonftrated 

 its truth. 



§ VI. Their 



