Among the rubbish at the bottom of the bottle, in which the coleps was found, was a minute dead Rotifer, the flesh of which was fast disappearing, but upon being examined with a power of nine hundred and sixty diameters, it was observed to swarm with extremely minute _vibriones_, the largest only appearing under that immense magnification like chains of bluish-green globules, not bigger than the heads of minikin pins, while the smallest were known by a worm-like wriggling, although their structure could not be defined. These _vibriones_ are probably members of the vegetable world, and they always appear when animal matter undergoes putrefaction. M. Pasteur has brought forward elaborate experiments to show that the development of the yeast plant is an act correlative to alcoholic fermentation, and in like manner the growth of _vibriones_ may stand in correlation to putrefactive decomposition. [Illustration: A, Euplotes (patella); B, side view of ditto; C, stylonichia.] Ehrenberg considered them animals, and fancied he detected in them a plurality of stomachs; but the vegetable theory is the more probable, at any rate of the species under our notice, which is often seen, though not always so minute. At this time two interesting animalcules were very plentiful--the _Euplotes patella_, and _Stylonichia_, both remarkable as exhibiting an advance in organization, which approximates them to the higher animals. In addition to cilia they possess _styles_, which take the place of the limbs of more elaborately-constructed creatures, and give a variety to their means of locomotion. The _Euplotes_ is furnished with an oval carapace covering the upper surface, which in different individuals, and probably at different ages, exhibits slightly varied markings round its margin, which in the specimen drawn above consisted of dots. They can run, climb, or swim, and exemplify a singular habit which several of the infusoria possess, that of moving for a little time in one direction, and then suddenly, and without any apparent cause, reversing it. If the reader is fond of learned appellations, he can call this _diastrophy_, but we do not know that he will be any the wiser for it.