Vegetable Staticks. ip 



But it is further to be confidered, that if 

 the fap moves in the form of vapour, and 

 not of water, being thereby rarefied, its ve- 

 locity will be increafed in a direct propor- 

 tion of the fpaces, which the fame quan- 

 tity of water and vapour would occupy ; 

 And if the vapour is fuppofed to occupy 10 

 times the fpace which it did, when in the 

 form of water, then it muft move ten times 

 fafter; 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. 



Experiment IV. 



From July 29. to Aug. 2^. I weighed 

 for 12 feveral mornings and evenings, a pa- 

 radife flock 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, whcfe fnrface was equal to 1589 

 fquare inches, or 11 fquare feet + 5 fquare 

 inches. 



C 2 The 



