Vegetable Statkhsl i o j 



trade fap in any plenty beyond their orifices ; 

 but as any fap is evaporated off, they can 

 by their ftrong attraction (affifted by the 

 genial warmth of the fun ) fupply the great 

 quantities of fap drawn off by perfpiration. 



Experiment XXXVL 



April 6th at 9. ^ ^- *ain the evening be- 

 fore, I cut off a Vine on a fouthern af- 

 peft, at a (Fig. 18.) two feet nine inches 

 from the ground, the remaining ftem a b, 

 had no lateral branches, it was f inch dia- 

 meter, I fixed on it the mercurial gage ay. 

 At 11 a m. the mercury was rifen to z, 15 

 inches higher than in the leg x, being pufhed 

 down at x , by the force of the fap which 

 came out of the ftem at a. 



At 4 p. m. it was funk an inch in the leg z y* 



April 7th at 8 a. m. rifen very little, a 

 fog : at it a. m. 'tis 17 inches high, and the 

 fog gone. 



April 10th at 7 a. m. mercury 18 inches 

 high 5 I then added more mercury, fo as to 

 make the furface^; 23 inches higher than x$ 

 the fap retreated very little into the ftem, 

 upon this additional weighty which fhews 



with 



