STUDIES AMONGST AMCEBiE. 
223 
sides around the current, and so as to remount the outer part of 
the cylinder, again to be drawn into the central stream. This 
circulation was accompanied by liberal outflows of wonderfully 
transparent diaphane with rushes of granules and regressions, but 
the motion in the end was strongly in the one direction, namely, 
remote from the small end. The Amoeba would expand and 
dilate, contract, and become sausage-shaped ; and it would turn, 
but always with the one end first, and never with the small end 
in advance. So large and so active a creature resembled greatly 
an amoeboid animalcule which has been called Pelomyxa, but it 
differs in many essential respects. It was a very wanderer — did 
not seem to settle down to take in food when surrounded with all 
sorts of things nice to others of its genus — and the sameness of 
the globular highly refractive bodies inside it was most remark- 
able. Evidently the constancy and the briskness of the move- 
ments, although no long processes or pseudopodia were ever 
projected, required a corresponding amount of sustentation. 
Perhaps this active Amoeba was in a non-devouring phase of a 
complex life cycle. This last idea appears to be consistent with 
observation, for I traced one, through its 6 fitful fever,’ until it 
became quieter, more rotund : then at last, and to my surprise, 
the granular spheres collected more definitely together to form 
an endosarc which soon became central. Here, then, the active 
Amoeba assumed the shape of that quiet form already described, 
but there was this internal difference — that the endosarc con- 
sisted of very refractive granules, globules, or spheres. 
The protoplasm of the diaphane of the Amoeba was un- 
doubtedly clear, but in the mass was not so transparent as the 
rounded projections which were formed every now and then, 
but possibly this was caused by their thinness. Under a high 
magnifying power ( t L- immersion), a granular appearance was 
decidedly seen in it. A contractile vesicle was usually to be 
seen, and it was carried along in the moving inside. Now this 
shows that the comparatively clear protoplasm had a part of it 
severed, as it were, from the rest, and in the midst there was 
this curious power of opening out to form a space, and closing 
in with sufficient force to drive water out of it into the sur- 
rounding part. $o refractive were the granular spheres which 
were scattered over the Amoeba, within a thin film of diaphane, 
and so large was their central transparent part, that they re- 
sembled a host of small spaces or vacuoles, but their ultimate 
fate, which will be noticed further on, disproves this notion. A 
nucleus so faint that it can be rarely seen exists in this Amoeba ; 
but when it becomes apparent it is seen to be very transparent, 
and to be environed by a clear peripheral line except at one 
spot. In the figure (fig. 6) it is in the midst of a mass of the 
refractive granules. 
