1 1 8 Vegetable Staticks* 
Experiment XXXVIII 
March io. at the beginning of the bleed- 
ing feafon, (which is many days fooner or 
later, according to the coldnefs or warmth, 
moifture or drynefs of the feafon) I then 
cut off a branch of a vine b f c g at b, (Fig ? 
20.) which was 3 or 4 years old, and ce- 
mented faft on it abrafs-coilar, with a fcrew 
in it; to that I fcrewed another brafs collar, 
which was cemented faft to the glafs tube 
%,-> 7 feet long and \ inch diam. (which I 
find to be the propereft diam.) to that I 
fcrewed others, to 38 feet height. Thefe 
tubes were faftened and fecured in long 
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 fix'd the glades with- 
out the wooden tubes, fattening them to 
fcaffoid poles, or two long iron fpikes drove 
into the wall. 
Before I proceed to give an account of 
the rife and fall of the fap, in the tubes I 
will 
■ V 
