.-r-J^- 



^^5 



inore amply discussed, and the practice 

 more generally adopted, that the more 

 substantial ground of real nutriment i^ 

 substance derived from the water, Avill be 

 uni\'ersally received. For it has been 

 ascertained, by a variety of experiments, 

 that all water contains earth and other 

 matter; that the purest rain-water has 

 likewise its oleaginous particles, and all 

 oil contains coal, which is an essential in- 

 gredient in the food of all vegetables. 

 Spring-water, it has also been ascertained, 

 is more nutritous to plants than rain-water ; 

 and river-water than spring-water. See 

 Mr. KiRWA^'s very perspicuous Treatise 

 on Manures. 



Mr. Marshall, in his Rural Economy 



of the Southern Counties, v. i2, p. 333, 



speaking of the watered meadows near 



II 2 Salisbury 



