3 4 8 Of Vi ? getation. 
a very confiderablc influence in expanding 
the fap in all its parts. The warmth was 
much greater on the body above ground, 
than on the roots which were two feet deep 5 
thofc roots, and part* of roots which are 
deepeft, as they feel much lefs of the Sun’s 
warmth, fo are they not fo foon, nor fo 
much affeded by the alternates of day and 
night, warm and cold : but that part of ve- 
getables, which is above ground, muQ have 
its fap confiderably rarified, when the heat 
increafed from morning to two a clock af- 
ternoon, fo much as to raife the fpirit in 
the 1 ft Thermometer from 21 to 48 degrees 
above the freezing point. 
When in the coldeft days of the winter 
1 7 24, th« froft was fo intenfe- as to freeze the 
furface of ftagnant water near an inch thick, 
then the fpirit in the Thermometer which was 
expofed to the open air, was fallen four de- 
grees below the freezing point ; the fpirit of 
that whofe ball was two inches under ground, 
was four degrees above the freezing point j 
the 3d, 4th and jth Thermometers were pro- 
portionably fallen lefs and Ids, as they were 
deeper, to the 6th Thermometer, which being 
two feet under ground, the fpirit was 10 de- 
grees above the freezing point. In this ftate of 
things 
