i ^3^ } 



The uncurled roots were not bitten. He tried a 

 few experiments as follows : — Fjrft, he put foot to 

 the infeds in the rows for two days -, and after that, 

 he pui: lirne to them for the fame time, but they 

 ftill kept lively: next he put a little fait, which de- 

 ftroyed them in a few hours. From which he in- 

 fers, that if coarfe fait were put into the ground at 

 the time the land is preparing for potatoes^ it would 

 ^fFedlually cure this diftemper, 



LETTER III. 



THIS writer attributes the caufe of the difeafq 

 to the method of earthing the ftems while in cul- 

 tivation j and that the branch, flriking root into 

 the new earthed-up foil, produces potatoes of fuch 

 a nature as the ye^r following to caufe the difeafe 

 complained of, 



To prevent the difeafe, he recommends the fets 

 to be taken from thofe potatoes that have not bred 

 any from the branch covered; or otherwife;^ to dig 

 the part the fets are to be raifed from. 



LETTER IV. 



: ..THIS writer thinks that the diforder proceeds, 

 from potatoes being fet in old tilled or worn-out 

 ground; for, though thofe potatoes may look^ 



tolerably 



