72 DROSERA ROTUNDiFOLIA. Cuap. IV 
Experiment 11.—A leaf was immersed in water at 145° (62°°7 
Cent.), which was raised to 156° (68°°8 Cent.). The tentacles 
became bright red and somewhat reflexed, with almost all the 
glands like porcelain; those on the disc. being still pinkish, 
those near the margin quite white. The leaf being placed as 
usual first in cold water and then in the strong solution, the 
cells in the tentacles became of a muddy greenish brown, with 
the protoplasm not aggregated. Nevertheless, four of the glands 
escaped being rendered like porcelain, and the pedicels of these 
glands were spirally curled, like a French horn, towards their 
upper ends; but this can by no means be considered as a 
case of true inflection. The protoplasm within the cells of the 
twisted portions was aggregated into distinct though excessively 
minute purple spheres. This case shows clearly that the proto- 
plasm, after having been exposed to a high temperature for a 
few minutes, is capable of aggregation when afterwards sub- 
jected to the action of carbonate of ammonia, unless the heat 
has been sufficient to cause coagulation. 
Concluding Remarks.—As the hair-like tentacles are 
extremely thin and have delicate walls, and as the 
leaves were waved about for some minutes close to the 
bulb of the thermometer, it seems scarcely possible 
that they should not have been raised very nearly to 
‘the temperature which the instrument indicated. 
From the eleven last observations we see that a tem- 
perature of 130° (54°4 Cent.) never causes the imme- 
diate inflection of the tentacles, though a temperature 
from 120° to 125° (48°8 to 51°6 Cent.) quickly pro- 
duces this effect. But the leaves are paralysed only 
for a time by a temperature of 130°, as afterwards, 
whether left in simple water or in a solution of car- 
bonate of ammonia, they become inflected and their 
protoplasm undergoes aggregation. This great dif- 
ference in the effects of a higher and lower tempera- 
ture may be compared with that from immersion in 
strong and weak solutions of the salts of ammonia; for 
the former do not excite movement, whereas the latter 
act energetically. A temporary suspension of the 
