I I 







I t 





i 







ll ' 



I 



1Ui 







%o J/e get able Staiicks, 



thcr, To as to let in air ; to prevent whirk; 



t c t r " CI i in- 



convenience, I further fecurcd the \n Vn , 



' ) fit 



with the cement of Bees- wax and Turpe 

 tine, binding a wet bladder over all. 



When the branch was thus fixed, I turned 

 it downwards, and the glafs tube upward? 

 and then filled both tubes full of water • 

 upon which Iimmediately applied the end of 

 my finger to clofe up the end of the fmali 

 tube, and immerfed it as fail as I could into 

 the glafs ciftern x, which was full of mer- 

 cury and water. 



When the branch was now uppermoft, and 

 placed as in this figure, then the lower end 

 of the branch was immerfed 6 inches in 

 water, viz. from r to /'. 



Which water was imbibed by the branch, 

 at its tranfverfe cut /' ; and as the water af- 

 cended up the fap veflels of the branch, 

 to the mercury afcended up the tube e z 

 from the cittern x ; fo as in half an hour's 

 time the mercury was rifen 5 inches and 

 $ high up to z. 



And this height of the mercury did in 

 fome mcafure mew the force with which the 

 fap was imbibed, tho' not near the whole 

 %ce j for while the water was imbibing, 



the 



