240 DIONEA MUSCIPULA, (Cuap. XIII. 
secretion nor movement. They were then dipped in water, 
their surfaces dried on blotting-paper, and replaced on the 
same leaf, the plant being now covered with a bell-glass. 
After 24 hrs. the damp meat had excited some acid secretion, 
and the lobes at this end of the leaf were almost shut. At 
the other end, where the damp gelatine lay, the leaf was 
still quite open, nor had any secretion been excited ; so that, 
as with Drosera, gelatine is not nearly so exciting a sub- 
stance as meat. The secretion beneath the meat was tested 
by pushing a strip of litmus paper under it (the filaments 
not being touched), and this slight stimulus caused the leaf 
to shut. On the eleventh day it reopened; but the end 
where the gelatine lay, expanded several hours before the 
opposite end with the meat. 
A second bit of roast meat, which appeared dry, though it 
had not been purposely dried, was left for 24 hrs. on a leaf, 
caused neither movement nor secretion. The plant in its 
pot was now covered with a bell-glass, and the meat absorbed 
some moisture from the air; this sufficed to excite acid 
secretion, and by the next morning the leaf was closely shut. 
A third bit of meat, dried so as to be quite brittle, was 
placed on a leaf under a bell-glass, and this also became in 
24 hrs. slightly damp, and excited some acid secretion, but 
no movement. 
A rather large piece of perfectly dry albumen was left at 
one end of a leaf for 24 hrs. without any effect. It was then 
soaked for a few minutes in water, rolled about on blotting- 
paper, and replaced on the leaf; in 9 hrs. some slightly acid 
secretion was excited, and in 24 hrs. this end of the leaf was 
partially closed. The bit of albumen, which was now 
surrounded by much secretion, was gently removed, and 
although no filament was touched, the lobes closed. In this 
and the previous case, it appears that the absorption of 
animal matter by the glands renders the surface of the leaf 
much more sensitive to a touch than it is in its ordinary 
state; and this is a curious fact. Two days afterwards the 
end of the leaf where nothing had been placed began to 
open, and on the third day was much more open than the 
opposite end where the albumen had lain. 
Lastly, large drops of a solution of one pari of carbonate 
of ammonia to 146 of water were placed on some leaves, but 
no immediate movement ensued. I did not then know of 
the slow movement caused by animal matter, otherwise £ 
4 
