404 UTRICULAEIA NEGLECTA. Chap. XVII. 



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 j^i'oject into the bladder, 

 and are directed towards its posterior end. The quad- 

 rifid and bifid processes no doubt are homologous 

 with the papillae on the outside of the bladder and 

 of the leaves; and we shall see that they are de- 

 veloped from closely similar papilla?. 



TJie Uses of the several Farts. — After the above long 

 but necessary description of the parts, we will turn to 

 their nses. 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 

 a<|uatic animals, and this they do on a large scale. In 

 tlie first lot of plants, which I received from the New 

 Forest early in July, a large proportion of the fully 



