374 PINGUICULA VULGARIS. Cua. XVI 
Experiment 9.—A chain of fibres of roast meat, as thin as 
bristles and moistened with saliva, were placed down one whole 
side, close to the narrow, naturally incurved edge of a leaf. 
In 3 hrs. this side was greatly incurved along its whole length, 
and after 8 hrs. formed a cylinder, about 4 of an inch (1:27 
mm.) in diameter, quite concealing the meat. This cylinder 
remained closed for 32 hrs., but after 48 hrs. was half unfolded, 
and in 72 hrs. was as open as the opposite margin where no 
meat had been placed. As the thin fibres of meat were com- 
pletely overlapped by the margin, they were not pushed at all 
inwards, across the blade, 
Experiment 10.—Six cabbage seeds, soaked for a night in 
water, were placed in a row close to the narrow incurved edge of 
a leaf. We shall hereafter see that these seeds yield soluble 
matter to the glands. In 2 hrs. 25 m. the margin was decidedly 
inflected; in 4 hrs. it extended over the seeds for about half 
their breadth, and in 7 hrs. over three-fourths of their breadth, 
forming a cylinder not quite closed along the inner side, and 
about *7 of an inch (1'778 mm.) in diameter. After 24 hrs, 
the inflection had not increased, perhaps had decreased. The 
glands which had been brought into contact with the upper 
surfaces of the seeds were now secreting freely. In 36 hrs. 
from the time when the seeds were put on the leaf the margin 
had greatly, and after 48 hrs. had completely, re-expanded. 
As the seeds were no longer held by the inflected margin, and 
as the secretion was beginning to fail, they rolled some way 
down the marginal channel. 
Experiment 11.— Fragments of glass were placed on the 
margins of two fine young leaves. After 2 hrs. 80 m. the 
margin of one certainly became slightly incurved; but the 
inflection never increased, and disappeared in 16 hrs. 30 m. 
from the time when the fragments were first applied. With the 
second leaf there was a trace of incurvation in 2 hrs, 15 m.,, 
which became decided in 4 hrs. 380 m., and still more strongly 
pronounced in 7 hrs., but after 19 hrs. 30 m. had plainly 
decreased. The fragments excited at most a slight and doubtful 
increase of the secretion; and in two other trials, no increase 
could be perceived. Bits of coal-cinders, placed on a leaf, pro- 
duced no effect, either owing to their lightness or to the leaf 
being torpid. 
Experiment 12.—We will now turn to fluids. A row of drops 
of a strong infusion of raw meat were placed along the margins 
of two leaves; squares of sponge soaked in the same infusion 
being placed on the opposite margins. My object was to ascer« 
