58 DROSERA ROTUNDIFOLIA. Cuap. IL 
still contained did not undergo aggregation any more 
than that which had exuded. In these specimens, as 
I may add, the individuality of the life of each cell 
was well illustrated. 
A full account will be given in the next chapter of 
the effects of heat on the leaves, and I need here only 
state that leaves immersed for a short time in water at 
a temperature of 120° Fahr. (48°8 Cent.), which, as we 
have seen, does not immediately induce aggregation, 
were then placed in a few drops of a strong solution 
of one part of carbonate of ammonia to 109 of water, 
and became finely aggregated. On the other hand, 
leaves, after an immersion in water at 150° (65°5 
Cent.), on being placed in the same strong solution, 
did not undergo aggregation, the cells becoming filled 
with brownish, pulpy, or muddy matter. With leaves 
subjected to temperatures between these two extremes 
of 120° and 150° Fahr. (48°8 and 65°5 Cent.), there 
were gradations in the completeness of the process ; 
the former temperature not preventing aggregation 
from the subsequent action of carbonate of ammonia, 
the latter quite stopping it. Thus, leaves immersed 
in water, heated to 130° (54°4 Cent.), and then in the 
solution, formed perfectly defined spheres, but these 
were decidedly smaller than in ordinary cases. With 
other leaves heated to 140° (60° Cent.), the spheres 
were extremely small, yet well defined, but many of 
the cells contained, in addition, some brownish pulpy 
matter. In two cases of leaves heated to 145° (62°-7 
Cent.), a few tentacles could be found with some of 
their cells containing a few minute spheres; whilst 
the other cells and other whole tentacles included 
only the brownish, disintegrated or pulpy matter. 
The fluid within the cells of the tentacles must be 
in an oxygeuated condition, in order that the force or 
