Chap. XVI. Of R i d g e s. 241 



reflects upon the Credit of Lauremhergius : 'Tis as 

 eafy to believe, that an Horfe, by feeding in a certain 

 Pafture, will degenerate into a Bull, and in other 

 Pafture revert to an Horfe again ; thefe are fcarce of 

 more different Species than Wheat and Rye are: If 

 the different Soil of Wittemberg and fhuringia change 

 one Species, they may the other* 



CHAP. XVL 



Of Ridges. 



THE Method of plowing Land up into Ridges 

 is a particular Sort of Tillage; the chief Ufe 

 of which is, the Alteration it makes in the Degrees 

 of Heat and Moifture, being two of the grand Re- 

 quifites of Vegetation ; for very different Degrees of 

 thefe are neceffary to different Species of Vegetables. 



Thofe Vegetables commonly fown in our Fields, 

 require a middle Degree of both, not being able to 

 live on the Sides of perpendicular Walls in hot Coun- 

 tries, nor under Water in cold ones, neither are they 

 amphibious, but mufl have a Surface of Earth not 

 covered, nor much foak'd with Water, which de- 

 prives them of their neceffary Degree of Heat, and 

 caufes them to languifh. The Symptoms of their 

 DHeafe are a pale or yellow Colour in their Leaves, 

 and a Ceffation of Growth, and Death enfues as fure 

 as from a Dropfy. 



The only Remedy to prevent this Difeafe in Plants 

 is, to lay fuch wet Land up into Ridges, that the Wa- 

 ter may run off into the Furrows, and be convey'd 

 by Ditches or Drains into fome River. 



The more a Soil is fi! I'd with Water, the lefs Heat 

 it will have. 



R • The 



