Crar. XVII DEVELOPMENT OF THE BLADDERS. 425 
simple elongated cells, runs up the short footstalk, 
and divides at the base of the bladder. One branch 
extends up the middle of the dorsal surface, and 
the other up the middle of the ventral surface. In 
full-grown bladders the ventral bundle divides close 
beneath the collar, and the two branches run on each 
side to near where the corners of the valve unite with 
the collar; but these branches could not be seen in 
very young bladders. 
The accompanying figure (fig. 23) shows a section, 
which happened to be strictly medial, through the foot- 
stalk and between the nascent antenn# of a bladder 
of Utricularia vulgaris, +, inch 
in diameter. The specimen was 
soft, and the young valve be- 
vame separated from the collar 3 
to a greater degree than is 
natural, and is thus represented. 
We here clearly see that the 
valve and collar are infolded 
prolongations of the walls of the 
bladder. Even at this early ae 
age, glands could be detected’ — (werieutaria vulgaris.) 
on the valve. The state of the Longitudinal section through 
a young bladder, of an inch 
quadrifid processes will presently i, ee ements 
be described. The antenne at this 
peviod consist of minute cellular projections (not shown 
in the above figure, as they do not lie in the medial 
plane), which soon bear incipient bristles. In five 
instances the young antenne were not of quite equal 
length ; and this fact is intelligible if I am right in 
believing that they represent two divisions of the 
leaf, rising from the end of the bladder; for, with 
the true leaves, whilst very young, the divisions are 
never, as far as I have seen, strictly opposite; they 
