Of Vegetation. 347 
dccpcft, as they fed much lefs of the Sun's 
warmth, fo are they not fo foon, nor fo 
much affcfted by the alternacies of day and 
night, warm and cold : But that part of ve- 
getables, which is above ground, muft have 
its Tap confiderably ratified, when the heat 
increafed from morning to two a clock after- 
noon, fo much as to raife the fpirit in the 
ift Thermometer from 21 to 48 degrees a. 
bove the freezing point. 
When in the coldeft days of the winter 
1724, the 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 fal- 
len four degrees below the freezing point 5 
the fpirit of that whofe ball was two inches 
under ground, was four degrees above the 
freezing point i the 3d, 4th and 5th Ther^ 
mometers were proportionably fallen lefs 
and lefs, as they were deeper, to the 6th 
Thermometer^ which being two feet under 
ground, the fpirit was 10 degrees above the 
freezing point. In this ftate of things the 
work of vegetation feemed to be wholly at 
^ Hand, at leaft within the reach of the 
froft* 
