[ 4S® ] 
frozen in both ; but thofe furfaces which rofe at right 
angles, and were therefore only in contadt with the cold 
atmofphere, did not freeze in equal times ; the one that 
had gone through this procefs before, froze much fooner 
than the frefh one. The above experiment was re- 
peated when the cold mixture was at 25°, 24°, and the 
atmofphere nearly the fame, and with the fame fuccefs ; 
only the leaves were longer in freezing, efi^ecially the 
frefli leaf, 
V. The vegetable juices above mentioned being fro- 
zen in the leaden veffel, the cold mixture at 28°, and the 
atmofphere the fame, a growing fir-lhoot was laid upon 
the furface, alfo a bean-leaf ; and upon remaining there 
fome minutes, they were found to have thawed the fur- 
face on which they lay. This I thought might arife from 
the greater warmth of thefe fubftances at the time of ap- 
plication ; but by moving the fir-flioot to another part, 
we had the fame effect .produced, 
VI. A frefli leaf of a bean was exactly weighed; it 
was then put into the cold atmofphere and frozen. In this 
ftate- it was put back into the fame fcale, and allowed to 
thaw. No alterationdn the weight w*as produced. 
It appears from the above experiments, that an ani- 
mal muf: be deprived of life before it can be frozen. 
Secondly, that thefe is an exertion, or an expence of ani- 
mal powers, in doing this, in proportion to the neceffity ; 
and that the whole animal life may be exhaufted in this 
way. Thirdly, that this power is iif pfoportion to 
the 
