248 On Trench Ploughing, 



March 1808, I had thirty-nine bushels to the acre ; 

 weighing sixty-four pounds the bushel : this is men- 

 tioned only to prove, that those Avho conceive that 

 trenching ruins land, are much mistaken. I am con- 

 vinced that if it had been threshed soon after harvest, 

 the produce would have exceeded fifty bushels to the 

 acre. 



whence the worms originate ; by confining some in boxes or 

 vials, to pass through their changes. I discovered in this 

 way, the wasp from which the peach worm originates. Some 

 other and better mode may be used, by those intelligent in 

 such investigations. It might lead to a discovery of reme- 

 dies, or preventives. They are found in the roots, body, 

 and even in the heart of the trees. Pear trees are not yet 

 injured ; though many are intermixed, in the orchard, with 

 the apple trees in which worms are found. I do not per> 

 ceive them in plumb trees. In my old orchards I have dis- 

 covered only one tree infested by the worms : this I shall 

 grub up and burn. 



