Sect. IV. Agriculture and Vegetation. 71 



quick-lime with dunghills, which are not 

 yet fufficiently putrefied, as it muft flop 

 that procefs. When once that procefs is 

 finifhed, many good effects may arife from 

 their junction, and particularly that of hin- 

 dering the oils to be volatilized, and of fix- 

 ing them. 



9 



IT is obferved of lime, that it is conti- 

 nually falling downwards, fo that, in a few 

 years, the greatefl part of it is to be found 

 lying together as deep as the plough goes. 

 This is owing to its great fpecific gravity. 



IT is like wife obferved by farmers, that 

 lime has a better effect on light foils than 

 oa ftiff, for the firft three years, but, after 

 that time, its operation turns much weaker. 

 Light foils are moft pervious to the air; 

 and as the good effects of all manures de- 

 pend on the influence of the air, that in- 

 fluence muft be ftronger in open foils than 

 in thofe which are more compact : but as 

 F 4 that 



