Chap. XVIL STRUCTURE OF THE BLADDER. 



403 



tremely thin transparent membrane, so that they can 

 be bent or doubled in any direction without being- 

 broken. They are lined with a delicate layer of proto- 

 plasm, as is likewise the short conical projection from 

 which they arise. Each arm generally (but not in- 

 variably) contains a minute, faintly brown particle, 

 either rounded or more commonly elongated, which 

 exhibits incessant Brownian movements. These par- 



FiG. 21. 



\JJtricularia neglecta.') 



Small portion of inside of blad- 

 der, much enlarged, showing quad- 

 rifid processes. 



Fig. 22. 

 {rtricularia neylecta.) 

 ■ One of the quadrifid processes 

 greatly enlarged. 



tides slowly change their positions, and travel from 

 one end to the other of the arms, but are commonly 

 found near their bases. They are present in the quad- 

 rifids of young bladders, when only about a third of 

 their full size. They do not resemble ordinary nuclei, 

 but I believe that they are nuclei in a modified con- 

 dition, for when absent, I could occasionally just dis- 

 tinguish in their places a delicate halo of matter, 

 including a darker spot. Moreover, the quadrifids of 

 Vtricularia montana contain rather lari^er and much 



