[ I2 3 3 
tioned to the neceffity, and the whole ve¬ 
getating powers may be exhaufted in this 
way.—This power is mod probably in 
proportion to the perfe&ion of the plant, 
the natural heat proper to each fpecies, 
and the age of each individual. It may 
alfo perhaps depend, in fome degree, on 
other circumftances; for in an experiment, 
the old fhoot did not lofe its powers, 
while that which was young, or growing, 
did; and in two other experiments we 
found, that the young growing fhoot of 
the fir, was with great difficulty frozen at 
io°, while a bean-leaf was eafily frozen 
\ 
at 22 ; and in another experiment, the 
young fhoot of the fir thawed the ice at 
28° much fafter than the leaf of the bean. 
The roots of vegetables are capable of 
refilling cold much more than the Hem or 
leaf. 
So far, animal and vegetable life appear 
to be the fame, yet an animal and vege¬ 
table 
