I 3S I 



their real progrefs, without meafuring them) and 

 imagine the head to be divided into four equal onts > 

 for the purpofcs of proving, in the firft place, the 

 impoflibility of their being timber at the outfet of 

 the calculation, and in the fecond, that they will 

 continue to bear their propoition to the increafc of 

 the fhafc -, which I fhall attempt in a manner fa 

 plain and fimple as to be intelligible to the conv 

 mon farmer. 



It will be allowed, I prefume, that an oak, in a 

 good foil and fituation, may, at 75 years from the 

 acorn, have acquired 40 feet length of fhaft, being 

 14 inches girt at the bafe,* 12 in the middle, and 

 10 inches at the top. Suppofe this terminating in 

 four equal branches, then it is manifeft, that none 

 of thefe branches can be meafurable timber at this 

 time jf for their aggregate contents at the bafe can- 

 not exceed the fimple content of the top of the 

 Ihaft, which is under 1 2 inches girt. 



The meafure of fuch an oak will be a ton, and 

 its value, as being under naval fize, three pounds at 

 thcnooft. 



♦ What is called the girt of timber, is one-fourth part of it» 

 circ\imference. 



t Oak timber is meafurable »s far as it hold* fix inches girt, and 

 sk9 farther. 



D a Then, 



