Of Vegetation. 347 



deepeft, as they feel much lefs of the Sun's 

 warmth, fo are they not fo foon, nor fo 

 much affefted by the alternacies of day and 

 night, warm and cold : But that part of ve- 

 getables, which is above ground, muft have 

 its fap confiderably rarilied, when the heat 

 increafed from morning to two a clock after- 

 noon, fo much as to raife the fpirit in the 

 ift Thermometer from si 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 ; 

 the fpirit of that whole ball was two inches 

 under ground, was four degrees above the 

 freezing point; 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 

 a ftand, at leaft within the reach of the 

 froft, 



But 



