- 



* * 



Vegetable Statich. 



8.5 



tity of thole air bubbles thus fucked out, 

 was but final! i yet in this and many other 

 experiments, I found that after fuch fac- 

 tion, the water was imbibed by the branch, 

 much more greedily, and in much greater 

 quantity than the bulk of the air was, which 

 was fucked out. Probably therefore, thefe 

 air bubbles, when in the fap vciTcls, do (top 

 the free afcent of the water, as is the cafe 

 of little portions of air got between the wa- 

 ter in capillary glafs tubes. 



When the mercury is railed to its grcateft 

 height, by precedent faction with the 

 mouth, ( which height it reaches fometimes 

 in 7 minutes, fometimes in half an hour or 

 an hour) then from that time it begins to 

 fall, and continues fo to do, till it is fallen 

 5 or 6 inches, the height the branch would 

 have drawn it to, without fucking with the 

 mouth. 



But when in a very warm day, the mer- 

 cury is drawn up 5 or 6 inches, ( without 

 precedent faction with the mouth ) then it 

 will ufually hold up to that height for fe- 

 veral hours, viz. during the vigorous warmth 

 of the fan ; becaufe the fan is all that time 

 ftrongly exhaling mpifture from the branch 



G * thro* 







