420 ON THE DIGESTIVE APPAEATUS OF Infusoria . 
from the multitude of which Prof. Ehrenberg inferred that a great number of 
stomachs existed in the animals. If the surrounding fluid contains few solid 
particles, the globules will be less firm, and they appear then in the manner in 
which they are observed in the Infusoria of ordinary uncoloured infusions, where 
sometimes such a globule presents only small individual particles, and consists for 
the most part of a mass of mucus, from which it has been rolled together. 
Sometimes two such globules in the interior of the body become so strongly 
pressed together through the strong contractions of the animal, that they remain 
together in combination. 
To observe the formation of these globules in the best manner, the observation 
of them should be begun directly after the Infusoria have come in contact with 
the coloured fluid; the taking up of the coloured matter occurs very rapidly, 
often in the course of half a minute; then it can be noticed how one coloured 
globule after the other comes forth out of the stomachs perfectly formed ; and 
how in the Paramacia , Cercaria , and Vorticella , they are afterwards pressed 
under the inner edge of the cavity of the animal, and how the new globules press 
forwards the former with the intervening mucus, so that the first is elevated 
almost upon the inner wall of the opposite side; at the opposite end of the cavity 
it is turned round and again driven down on the other side; and thus the mass - 
of globules continues to accumulate, even till each is pushed out at the anus. 
The number of globules is sometimes so great, that the whole cavity of the 
animalcule is filled with them, and they lie so near one-another, that they form 
together as it were one great ball, which frequently, as in the Vorticellce , revolves 
slowly round its centre. This turning round arises, as I have perfectly assured 
myself, from the force with which the newly-formed globules in the stomach are 
driven into the cavity, and pushed against the under edge of the existing ball. 
In other cases, on the contrary, where few globules exist, there appears sometimes 
that circular movement of the same, of which I spoke at the outset; but it is 
not clear to me from what external cause this motion arises. 
It is thus that the matter which the true Infusoria are able to take up, is 
brought into the form of a globule in the cavity of the body, and here the 
nutritive matter becomes absorbed out of these globules; the excrementitious 
matter is for the most part conveyed away by the very globules in which it 
entered; still sometimes the intervening mucus is absorbed, and the particles of 
the globules separate themselves in the interior of the body; but this only 
seldom occurs. 
What then are these vesicular cavities, which often in so great numbers, and 
of such various sizes, move about in the interior of Infusoria ? Stomachs they 
are certainly not; with the ingested globules of which we have been speaking, 
they have nothing to do, although sometimes the globules extend into these 
