Vegetable Staticks. ni 



branch, as I have found by fixing the like 

 gages to them in July. 



Experiment XXXIX, 



March 10, at the beginning of the bleed- 

 ing feafon, (which is many days fooner or 

 later, according to the cokinefs or warmth, 

 moifture or drynefs of the feafon) I then 

 cut off a branch of a vine b f c g at it, (Fig. 

 20.) which was 3 or 4 years old, and ce- 

 mented faft on it a brafs - collar , with a 

 fcrew in it 5 to that I fcrewed another brafs- 

 collar, which was cemented faft to the glafs 

 tubes , 7 feet long and ^inch diam. (which 

 I find to be the propereft diam,) to that 

 I fcrewed others, to 3 8 feet height. Thefe 

 tubes were faftened and fecur'd in iGng 

 wooden tubes, 3 inches fquare , one fide of 

 which was a door opening upon hinges; 

 the ufe of thofe wooden tubes was to pre- 

 ferve the glafs tubes from being broke by 

 the freezing of the fap in them in the 

 night. But when the danger of hard frofts 

 was pretty well over, as at the beginning of 

 April, then I ufually fixt the glafTes with- 

 out the wooden tubes P fattening them to 

 z fcaffold 



