Sed. II. Agriculture and Vegetation. 153 



FROM what has been faid we may learn, 

 Cor. i. That as hot weather hurts the 

 formation of nitre, by exhaling it, and as 

 the winter and fpring is the time in which 

 it is moftly generated, all dung fhould be 

 laid out in thofe feafons. 



Cor. 2. As thefe manures become fer- 

 tile by the action of the air, the longer 

 they are expofed on the furface of the earth, 

 fo much the fafter will they be converted 

 to the nitrous fait. Farmers are now con- 

 vinced of this from experience : but fuch 

 bodies as contain a nutritive juice already 

 formed, as woollen rags, hair, horn-ihav- 

 ings, leather, faw-duft ; or thofe which 

 already exifl in the form of a neutral fait, 

 fuch as fea-falt, cannot be benefited by the 

 influence of the air. Experience has like- 

 wife confirmed this obfervation. Thefe are 

 ftrong proofs of the juftnefs of the pre- 

 ceding reafoning. 



Cor. 



