MICROSCOPIC ORGANISMS IN INTESTINAL CANAL. 273 
There is, however, a much more remarkable form of sporan- 
gium which appears to be interchangeable with the common one, 
sometimes almost entirely replacing it, sometimes occurring in 
various proportions along with it, and sometimes appearing in 
curious intermediate forms which combine the characters of both 
varieties in one and the same individual. The first occasion 
on which they were observed was in an artificial cultivation, 
consisting of a portion of recent, freshly boiled cow dung into 
which a normal sporangium from a previous cultivation had 
been introduced. Forty-eight hours after the cultivation had 
been set, the surface was found to be covered by a sprinkling of 
very minute hyaline sporangoid bodies situated on the projecting 
points of the medium. ‘These on microscopic examination were 
found to consist of aggregations of large Amcbe which in 
general were still readily separable and capable of resuming 
independent activity in the nutritive fiuid into which they were 
introduced. On the following day the sporangia had increased 
in size and numbers, some of them being of a pearly-white 
colour, others pale yellow, and others of a bright warm Indian 
yellow. The white ones consisted of amcebal aggregates like 
those observed on the previous day; the pale yellow ones con- 
tained similar bodies, and a certain proportion of masses of 
minute oval or broadly fusiform cellules (Pl. XVIII, fig. 14) ; 
the Indian yellow sporangia contained enormous accumulations 
of such cellules and a few large Amcebee. The sporangial mem- 
brane was very distinctly defined in some cases, and on its 
rupture masses of the cellules (Pl. X VIII, fig. 12) and large dis- 
tinct Aicebze were forced out into the fluid of the preparation. 
The cellules were, as before mentioned, broadly fusiform or oval 
in outline (Pl. XVIII, fig. 13 4). They were flattened, colour- 
less, and contained a large refractive and apparently oily nucleolus 
of greenish yellow colour with a brillant shining nucleolus 
within it. ‘I'he cells measured on an average about 6°2 x 3°7 pn, 
and their oily nuclei 1°8 x 0°9 u. ‘In most cases when they first 
escaped from the sporangia they were aggregated into small 
lumps or groups by means of a gelatinous and very faintly 
molecular basis-substance which soon dissolved and disappeared 
in the nutritive fluid (PI. XVIII, fig. 18 a). 
The presence of sporangia containing similar cellules was 
recognised on several subsequent occasions. ‘The sporangia in 
these cases varied in colour from clear pale yellow to full bright 
vermilion, a phenomenon dependent partly on the proportion of 
cellules present in them in relation to Amcebe or normal spores, 
and partly on the proportion of oily matter around the nucleoli. 
In some cases this was hardly represented, in others it formed a 
large full-coloured globule, and in these the colour of. the 
