H4 p r e get able Statich. 



It is needful to fhade all the cemented 

 joints from the Sun with loofe folds of 

 paper, elfe its heat, will often melt them , 

 and fo dilate the cement, as to make it 

 be drove forcibly up the tube , which de- 

 feats the Experiment. 



The Vines to which the tubes in this Ex- 

 periment were fixed, were 20 feet high from 

 the roots to their top 5 and the glafs tubes 

 fixed at feveral heights h from the ground, 

 fronvfix to two feet. 



The fap would rife in the tube the firU 

 day, according to the different vigor of the 

 bleeding ftate of the Vine, either i, 2, 5, 

 1 2, 1 5 , or 2 5 feet 5 but when it had got to its 

 greateft height for that day, ifitwasinthe 

 morning, it would conftantly begin to fijfa- 

 fide towards noon, 



If the weather was very cool about the 

 middle of the day, it would fubfide only 

 from 11 or 12, to two in the afternoon 5 

 but if it were very hot weather, the fap 

 would begin to fubfide at 9 or 10 a clock, 

 and continue fubfiding till 4, 5, or 6 in the 

 evening, and from that time it would con- 

 tinue ftationary for an hour or two; after 

 which it would begin to rife a little, but 



nor 



