290 DIONZA MUSCIPULA. Quar. XIIL 
the glands of Drosera evidently stands in relation to 
the habits of the two plants. Ifa minute insect alights 
with its delicate feet on the glands of Drosera, it is 
caught by the viscid secretion, and the slight, though 
prolonged pressure, gives notice of the presence of 
prey, which is secured by the slow bending of the 
tentacles. On the other hand, the sensitive filaments 
of Dionza are not viscid, and the capture of insects 
can be assured only by their sensitiveness to a 
momentary touch, followed by the rapid closure of 
the lobes. 
As just stated, the filaments are not glandular, and 
do not secrete. Nor have they the power of absorption, 
as may be inferred from drops of a solution of car- 
bonate of ammonia (one part to 146 of water), placed 
on two filaments, not producing any effect on the 
contents of their cells, nor causing the lobes to close. 
When, however, a small portion of a leaf with an 
attached filament was cut off and immersed in the same 
solution, the fluid within the basal cells became almost 
instantly aggregated into purplish or colourless, irré- 
gularly shaped masses of matter. The process of 
aggregation gradually travelled up the filaments from 
cell to cell to their extremities, that is in a reverse 
course to what occurs in the tentacles of Drosera when 
their glands have been excited. Several other fila- 
ments were cut off close to their bases, and left for 1 hr. 
30 m. in a weaker solution of one part of the carbonate 
to 218 of water, and this caused aggregation in all 
the cells, commencing as before at the bases of the 
filaments. 
Long immersion of the filaments in distilled water 
likewise causes aggregation. Nor is it rare to find 
the contents of a few of the terminal cells in a 
spontaneously aggregated condition. The aggregated 
