Cuar, XVI. MOVEMENTS OF THE LEAVES. 373 
apart from one another. After 24 hrs. the margin was greatly 
and equally incurved (see fig. 16) throughout this space, and for 
a length of -12 or -13 of an inch (3'048 or 3302 mm.) above and 
below each bit; so that the margin had been affected over a 
greater length between the two bits, owing to their conjoint 
action, than beyond them. The bits of meat were too large io 
be clasped by the margin, but they were tilted up, one of them so 
as to stand almost vertically. After 48 hrs, 
the margin was almost unfolded, and the 
bits had sunk down. When again exa- 
mined after twa days, the margin was quite 
unfolded, with the exception of the natu- 
rally inflected edge; and one of the bits 
of meat, the end of which had at first 
touched the edge, was now ‘067 of an inch 
(1:70 mm.) distant from it; so that this 
bit had been pushed thus far across the 
blade of the leaf. 
Experiment 7.—A bit of meat was placed 
close to the incurved edge of a rather young 
leaf, and after it had re-expanded, the bit 
was left lying ‘11 of an inch (2°795 mm.) 
from the edge. The distance from the edge ie 46. 
to the midrib of the fully expanded leaf (pinguicula vulgaris) 
was ‘85 of an inch (8°89 mm.); so that the Outline of leaf, with 
bit had been pushed inwards and across LS ea 
nearly one-third of its semi-diameter. of meat. 
Experiment 8.—Cubes of sponge, soaked in a strong infusion 
of raw meat, were placed in close contact with the incurved 
edges of two leaves,—an older and younger one. The distance 
from the edges to the midribs was carefully measured. After 
1 hr. 17 m. there appeared to be a trace of incurvation. After 
2 hrs. 17 m. both leaves were plainly inflected; the distance 
between the edges and midribs being now only half what it was 
at first. The incurvation increased slightly during the next 
43 hrs., but remained nearly the same for the next 17 hrs. 30 m 
In 35 hrs, from the time when the sponges were placed on the 
leaves, the margins were a little unfolded—to a greater degree 
in the younger than in the older leaf. The latter was not quite 
unfolded until the third day, and now both bits of sponge were 
left at the distance of ‘1 of an inch (2°54 mm.) from the edges; 
or about a quarter of the distance between the edge and midrib. 
A third bit of sponge adhered to the edge, and, as the margin 
unfolded, was dragged backwardg, into its original position. 
oe et Be 
ee 
