[ 9i ] 



ftagnated, (hould, when drawn off, leave a thick 

 fcum upon the grafs, which foon becomes fo glu- 

 tinous, as to attain a fubftance not unlike white 

 lqather ? 



I have juft feen a letter from Mr. Young, fay- 

 ing, that Dr. Priestley has given a new theory 

 of vegetation, by his phlogifton, contrary to his 

 opinion ; and as the Dodlor quoted page 1 1 of the 

 Treatife on Water-Meadows, in fupport of it, 

 Mr. Young wifhes me to inform him, " Whether 

 I did not know inftanccs to the contrary?" I am 

 by no means equal to the tafk of entering into the 

 merits of the difpute. My experience juftifies 

 me to declare, that I have feen as great improve- 

 ment upon land watered with quite clear water 

 as I ever did by thick muddy water. 



I have had the pleafure to fee a copy of Mr, 

 Wimpey's letter to you: I am happy to find the 

 fubjecT: treated in fo mafterly a manner; and am 

 not furprized to find him differ fo much from 

 me in what he fays upon land fprings; they proba- 

 bly have not fallen fo much under his obfervation. 

 I write from fads that are every day under my eye. 



You will be pleafed to obferve, upon the whole, 

 I by no means declare that the run of farm-yards, 



