On Calcarious mid 'Gypfiom Earths. gj 



fifteen bufhels to tlie acre: though this appeared fotnewhat 

 better than the reft of the field, the difference was fo trifling 

 as to warrant no conclufions in its favour. 



No. 17. 

 [April, 1791.3 Strewed puiverizied oyfter-ffhells over half 

 an acre of poor worn out ground^ on which rye grafs had 

 been fown the year before; could not perceive that the grafs 



was benefitted by it. 



No. 18., 



Strewed feven bufhels of ground oyfter-fheils ovqrhalf au 

 acre of rye, in the poor foil before defcribed in experiment 

 No. 1 1, and three bufliels of Gypfum on another half acre 

 adjoining; fowed ten pounds of red clover feed over both: 

 the rye not better than the reft of the field ; the clover feed 

 was bad, and came up thinly ; that, however, dreffed with 

 oyfter-ftiells, much better than that manured with Gypfum. 

 I own this furprized me, as the refult of every other experi- 

 ment of oyfter-fheils on grafs (having made feveral upon a 

 fmall fcale, which I have not noted) has been unfavourable. 

 I, however, attribute that to the extreme poverty of the foil, 

 which imbibed the oils contained in the frefli oyfter-fheils, and 

 thus fuffcred the air to make an impreflion upon them, which 

 I fuppofe it could not do immediately on richer grounds. 



From the above experiments, I think we may fairly draw 

 the following inferences. 



