404 UTRICULARIA NEGLECTA. Cuar. XVIL 
more regularly spherical, but otherwise similar, par- 
ticles, which closely resemble the nuclei in the cells 
forming the walls of the bladders. In the present 
case there were sometimes two, three, or even more, 
nearly similar particles within a single arm; but, as 
we shall hereafter see, the presence of more than 
one seemed always to be connected with the absorption 
of decayed matter. 
The inner side of the collar (see the previous fig. 20) 
is covered with several crowded rows of processes, dif- 
fering in no important respect from the quadrifids, 
except in bearing only two arms instead of four; they 
are, however, rather narrower and more delicate. I shall 
call them the bifids. They project into the bladder, 
and are directed towards its posterior end. The quad- 
rifid and bifid processes no doubt are homologous 
with the papille on the outside of the bladder and 
of the leaves; and we shall see that they are de- 
veloped from closely similar papille. 
The Uses of the several Parts—After the above long 
but necessary description of the parts, we will turn to 
their uses. The bladders have been supposed by some 
authors to serve as floats; but branches which bore 
no bladders, and others from which they had been 
removed, floated perfectly, owing to the air in the 
intercellular spaces. Bladders containing dead and 
captured animals usually include bubbles of air, but 
.these cannot have been generated solely by the pro- 
cess of decay, as I have often seen air in young, clean, 
and empty bladders; and some old bladders with much 
decaying matter had no bubbles. 
The real use of the bladders is to capture small 
aquatic animals, and this they do on a large scale. In 
the first lot of plants, which I received from the New 
Forest early in July, a large proportion of the fully 
