Cuar. XVII] DEVELOPMENT OF THE BLADDERS. 343 
vulgaris, 4, inch in diameter. The specimen was soft, and 
the young valve became separated from the collar to a greater 
degree than is natural, and is thus represented. We here 
clearly see that the valve and collar are infolded prolon- 
gations of the wall of the bladder. Even at this early age, 
glands could be detected on the valve. The state of the 
quadrifid processes will presently be described. The antenne 
at this period 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 antenna were not of quite equal length; and this 
Fic. 24. 
(Utricularia vulgaris.) 
Young leaf from a winter bud, showing on the left side a bladder in its earliest stage 
of development. 
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 must therefore be developed one after the other, and so 
it would be with the two antenna. 
At a much earlier age, when the half formed bladders are 
only sy inch (+0846 mm.) in diameter or a little more, they 
present a totally different appearance. One is represented 
on the left side of the accompanying drawing (fig. 24). The 
young leaves at this age have broad flattened segments, with 
