[Vegetable Statich. 19 



But it is further to be confidered, that if 

 the fap moves in the form of vapor and 

 not of water, being thereby ratified, its ve- 

 locity will be increafed in a dired propor- 

 tion of the fpaces, which the fame quan- 

 tity of water and vapor would occupy : 

 And if the vapor is fuppofed to occupy 10 

 times the fpace which it did, when in the 

 form of v/ater, then it muft move 10 times 

 fafter 5 fo that the fame quantity or weight 

 of each may pafs in the fame time, thro 3 

 the fame bore or tube : And fuch allow- 

 ance ought to be made in all thefe calcu- 

 lations concerning the motion of the fap ia 

 vegetables. 



Experiment IV. 



From July 29. to Aug. 25. I weighed 

 for 12 feveral mornings and evenings, zfia* 

 radife ftock Apple-tree, which grew in a 

 garden pot, covered with lead , as the Sun- 

 flower : it had not a bufhy head full of leaves, 

 but thin fpread, being in all but 163 leaves 5 

 whofe furface was equal to 1589 fquare 

 inches, or 1 1 fquare feet -\- 5 fquare inches. 



The greateft quantity it perfpired in 1 z 

 C z hours 



