Mode of cultivating Indian Corn, &c. 187 



thereby tearing the wood work to pieces, when you take 

 them out to sharpen ; then wedging and splitting the 

 timbers, when you put them in again ; thence to loosing 

 teeth, and half-harrowing — Virginian style — Is it so in 

 Pennsylvania? These teeth are gradually shouldered 

 up from the under part of the timber to the top, burnt in, 

 so that they fit as close as wax, and, when keyed above, 

 cannot come out or move. These holes, being burnt 

 exactly of the same size, will admit any change of shape 

 to the tooth below. Now, this same stock, which, if 

 made of good timber, will last a generation, and will re- 

 ceive the addition of ten teeth behind, to divide the se- 

 ven inch spaces into three and a half, for harrowing in 

 grain, or a full set. twenty-one, short teeth, and square, 

 to put in grain, will answer in the place of two. This 

 harrow, I think, will be free from choaking, (the general 

 objection to them) for the last mentioned ten teeth, being 

 all behind, are seven inches apart. 



