BY THE SWARM-CELLS OF MYCETOZOA. 439 
Numbers of observations of a similar eharaeter were made, 
which I need not describe in detail. 
During one observation, a swarm-cell took in at different 
times two black particles of inorganie matter: one was enclosed 
in a vacuole and remained there as long as the observation was 
continued; the other, after being shifted into all parts of the 
body-substance, was simply turned out at the posterior end, not 
apparently by the rupture of a vacuole. 
Powdered carmine was readily seized upon. On one occasion 
I watched for twenty minutes the efforts of a long irregular 
pseudopodium to embrace a large granule, but the finger-like 
extensions seemed unable to grasp it; at length they succeeded, 
and the object was drawn in, when the postericr end of the 
swarm-cell assumed, and retained until the close of the observa- 
tion, the usual rounded form. 
I have seen carmine discharged in the same manner as the 
black particle above described. And here I would refer to what 
suggests a power of discrimination in different species of swarm- 
cells. While, as just stated, carmine was greedily ineorporated by 
swarm-cells of Stemonitis, I have supplied it to those of Amauro- 
chete, which I had in full vigour and vast abundance ; but although 
they spread out pseudopodia which occasionally caught hold of a 
carmine granule and retained it for some seconds, none were 
taken in. I have tried the experiment two or three hours after 
their issuing from the spores, and also when they had been hatched 
for more than a day, but in no instance have I seen a granule of 
carmine within the substance of Amaurochate. 
Although in Stemonitis fusca carmine was retained for many 
hours, I was unable to detect any absorption, though I made 
careful drawings from time to time of the size of the particles, 
and no colour was communicated to the clear contents of the 
vaeuoles in which they were enclosed, such as is referred to by 
De Bary (p. 452) in the plasmodium of Didymium Serpula. I 
have watched the swarm-cells of Zrichia fragilis, which hatched 
three days after placing the spores in water, when the prepara- 
tion abounded with bacilli; these behaved in the same way as 
those of Stemonitis, throwing out more or less delicate pseudo- 
podia, to which bacilli adhered, and were then drawn in and 
stored in vacuoles; many contained three vacuoles, each holding 
four to five bacilli. 
I have had the same results with the spores of Chondrioderma 
