Hi 



■5. 



• f 



TOQB 



. 





• * 



.- 







Vegetable Stattch. ip 



But it is further to be confidered, that if 

 the fap moves in the form of vapor and 

 not of water, being thereby rarified, its ve- 

 locity will be incrcafed in a direct 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 water, then it mutt move 10 times 

 fatter > fo that the fame quantity or weight 

 of each may pafs in the fame time, thro* 

 the fame bore or tube : And fuch allow- 

 ance ought to be made in all thefe calcu- 

 lations concerning the motion of the fap in 

 vegetables. 



i 



Experiment IV. 



Prom July 29. to Aug. 25. I weighed 

 for 12 feveral mornings and evenings, zpa* 

 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; 

 whofe furface was equal to 1589 fquare 

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



The greateft quantity it perfpired in 1 % 



C z hour^ 





