} 8 Vegetable Staticksl 



Experiment XX. 



I provided me 6 Thermometers-, whofe 

 items were of different lengths, viz. from 

 is inches to 4 feet. I graduated themali 

 by one proportional fcale, beginning from 

 the freezing point ; which may well be 

 fixed, as the utmoft boundary of vegetation 

 on the fide of cold, where the work of ve- 

 getation ceafes , the watry vehicle beginning 

 then to condenfe and be fixed 5 tho 8 many 

 trees, and fome plants, as grafs, mofs, &c> 

 do furvive it 5 yet they do not vegetate at 

 that time. 



The greateft degree of heat, which I mark- 

 ed oa my Thermometers y was equal to that 

 of water, when heated to the greateft de- 

 gree, that I could bear my hand in it, with. 

 out ftirring it about. A degree of heat, 

 "which is the middle, between the freezing 

 point, and the heat of boiling water, which 

 being too great for vegetation, may there- 

 fore be fixed , as the utmoft boundary of 

 vegetation, on the warm fide 5 beyond v/hich 

 plants will rather fade than vegetate, fuch 

 a degree of heat feparating and difperfing , 



inftead 



