1 6 ffegetahle Staticks. 



near eleven times the velocity thro' the fur- 

 face of the roots, that it does thro' the fur- 

 face of the leaves. 



And fetting the roots at a medium at 12 

 inches long, they muft occupy a hemifphere 

 of earth two feet diameter, that is 2. 1 cu- 

 bick feet of earth. 



By comparing the furfaces of the roots of 

 plants, with the furface of the fame plant 

 above ground , we fee the neceffity of cut- 

 ting off many branches, from a tranfplanted 

 tree : for if 256 fquare inches of root in 

 furface was neceffary to maintain this Cab- 

 bage in a healthy natural ftate : fuppofe upon 

 digging it up, in order totranfplanr, half the 

 roots be cut off (which is the cafe ofmoft 

 young tranfplanted trees) then it's plain, that 

 but half the ufual nourifhment can be car- 

 ried up, through the roots, on that account 5 

 and a very much lefs proportion on account 

 of the fmall hemifphere of earth, the new 

 planted fhortened roots occupy > and on ac- 

 count of the loofe pofition of the new turn- 

 ed earth, which touches the roots at firft 

 but in few points. This ( as well as ex- 

 perience) ftrongly evinces the great necef- 

 fity of well watering new plantations. 



Which 



