that nothing was left except its transparent coat; [page 437] also a yellow chitinous head of some animal with an internal fork, to which the oesophagus was suspended, but I could see no mandibles; also the double hook of the tarsus of some animal; also an elongated greatly decayed animal; and lastly, a curious flask-shaped organism, having the walls formed of rounded cells.  Professor Claus has looked at this latter organism, and thinks that it is the shell of a rhizopod, probably one of the Arcellidae.  In this bladder, as well as in several others, there were some unicellular Algae, and one multicellular Alga, which no doubt had lived as intruders.

A second bladder contained an Acarus much less decayed than the former one, with its eight legs preserved; as well as remnants of several other articulate animals.  A third bladder contained the end of the abdomen with the two hinder limbs of an Acarus, as I believe.  A fourth contained remnants of a distinctly articulated bristly animal, and of several other organisms, as well as much dark brown organic matter, the nature of which could not be made out.

Some bladders from a plant, which had lived as an epiphyte in Trinidad, in the West Indies, were next examined, but not so carefully as the others; nor had they been soaked long enough.  Four of them contained much brown, translucent, granular matter, apparently organic, but with no distinguishable parts.  The quadrifids in two were brownish, with their contents granular; and it was evident that they had absorbed matter.  In a fifth bladder there was a flask-shaped organism, like that above mentioned.  A sixth contained a very long, much decayed, worm-shaped animal.  Lastly, a seventh bladder contained an organism, but of what nature could not be distinguished.]

Only one experiment was tried on the quadrifid processes and glands with reference to their power of absorption.  A bladder was punctured and left for 24 hrs. in a solution of one part of urea to 437 of water, and the quadrifid and bifid processes were found much affected.  In some arms there was only a single symmetrical globular mass, larger than the proper nucleus, and consisting of yellowish matter, generally translucent but sometimes granular; in others there were two masses of different sizes, one large and the [page 438] other small; and in others there were irregularly shaped globules; so that it appeared as if the limpid contents of the processes, owing to the absorption of matter from the solution, had become aggregated sometimes round the nucleus, and sometimes into separate masses; and that these then tended to coalesce.  The primordial utricle or protoplasm lining the processes was also thickened here and there into irregular and variously shaped specks of yellowish translucent matter, as occurred in the case of Utricularia neglecta under similar treatment.  These specks apparently did not change their forms.