IO2 'The Principles of Part III. 



be related by themfelves, diftinct from all 

 reafoning ; for we may err in the latter, 

 but the former is truth itfelf. I mould 

 have been glad to have repeated thefe ex- 

 periments, efpecially with a poorer foil 

 than what I found, by experiment, this to 

 be. I mould have been glad to have had 

 a greater fund of experiments to have rea- 

 foned upon, as there is always danger of 

 fome miftake in reafoning from a fingle 

 experiment. But it is to be remembered, 

 that fuch experiments can be made only 

 once a-year, and there is no time left now 

 to repeat and augment them. As it then 

 ftands, I mall draw fome conclufions from 



Corollary i. Virgin earth, taken up within 

 a foot of the furface, and from a bank which 

 had a north afpecl:, contains in itfelf the prin- 

 ciples of vegetation in great plenty. Such 

 earth is ufed as a manure by farmers ; and 

 they obferve, that virgin foil wilt fructify 

 earth much richer in appearance than itfelf. 



Cor. 



