66 ESSAYS AND OBSERVATIONS 



for many years after, remaining on the 

 furface, at leafl, the earthy part of it. 



That if trees are planted too deep ac 

 firft, they make no progrels till the roots 

 rife, and run alongft the furface. Even 

 old trees do not pufli their roo^s down- 

 wards ; and though the weight of the 

 trees deprefs that part of them which join 

 the trunks, yet thefe, when at fuch a di- 

 Itance as not to be influenced by the in- 

 cumbent weight of the tree, rife to the 

 top. 



Some experiments are now trying, to 

 determine, whether the fame pratlice 

 of {hallow ploughing will anlwer here 

 as it does in Norfolk, and other pla- 

 ces of the woild. For though I have 

 had no opportunities of feeing their 

 method, yet there is reafon to be- 

 lieve it anfwers in many of the fouthern 

 climates, where, from the accounts gi- 

 ven of the nature and number of cattle 

 they imploy in working a plough, it is 

 impofllble to fuppofe they go deep ; and 



if 



