Cuar. XVL] PINGUICULA LUSITANICA. 317 
a leaf, under the naturally incurved margin. In 2 hrs. 30 m. much 
secretion was excited, and next morning the margin on this side was 
more incurved than the opposite one, but not to so great a degree 
as in the last case. The margin unfolded at the same rate as before. 
aF proportion of the albumen was dissolved, a remnant being stil! 
eit. 
(3) Large bits of albumen were laid in a row on the midribs of two 
leaves, but produced in the course of 24 hrs. no effect; nor could this 
have been expected, for even had glands existed here, the long bristles 
would have prevented the albumen from coming in contact with them. 
On both leaves the bits were now pushed close to one margin, and in 
3 hrs. 30 m. this became so greatly inflected that the outer surface 
touched the blade; the opposite margin not being in the least affected. 
After three days the margins of both leaves with the albumen were 
still as much inflected as ever, and the glands were still secreting 
copiously. With Pinguicula vulgaris I have never seen inflection 
lasting so long. 
(4) Two cabbage seeds, after being soaked for an hour in water, were 
placed near the margin of a leaf, and caused in 3 hrs. 20 m. increased 
secretion and incurvation. After 24 hrs. the leaf was partially 
unfolded, but the glands were still secreting freely. These began to 
dry in 48 hrs., and after 72 hrs. were almost dry. The two seeds were 
then placed on damp sand under favourable conditions for growth ; but 
they never germinated, and after a time were found rotten. They had 
no doubt been killed by the secretion. 
(5) Small bits of a spinach leaf caused in 1 hr. 20 m. increased se- 
cretion; and after 3 hrs. 20 m. plain incurvation of the margin. The 
margin was well inflected after 9 hrs. 15 m., but after 24 hrs. was 
almost fully re-expanded. The glands in contact with the spinach 
became dry in 72 hrs. Bits of albumen had been placed the day 
before on the opposite margin of this same leaf, as well as on that of a 
leaf with cabbage seeds, and these margins remained closely inflected 
for 72 hrs., showing how much more enduring is the effect of albumen 
than of spinach leaves or cabbage seeds. 
(6) A row of small fragments of glass was laid along one margin of 
a leaf; no effect was produced in 2 hrs. 10 m., but after 3 hrs. 25 m. 
there seemed to be a trace of inflection, and this was distinct, though 
not strongly marked, after 6 hrs. The glands in contact with the 
fragments now secreted more freely than before; so that they appear 
to be more easily excited by the pressure of inorganic objects 
than are the glands of Pinguicula vulgaris. The above slight 
inflection of the margin had not increased after 24 hrs., and the glands 
were now beginning to dry. The surface of a leaf, near the midrib 
and towards the base, was rubbed and scratched for some time, 
but nomovement ensued. The long hairs which are situated here were 
treated in the same manner, with no effect. This latter trial was made 
because I thought that the hairs might perhaps be sensitive to a touch, 
like the filaments of Dionza, 
