DR. DUFFIN, ON PROTOPLASM. 955 
extended aggregations, whence a few fresh threads may issue, 
but in these the movement of the granules ultimately ceases. 
Nevertheless the granules in the substance of the threads are 
as distinct as before, till the diffusmg influence of the water 
gradually dissolves the whole. 
In order to give a clear insight into the consistence of the 
substance of the pseudopodia, Schultze places a Miliolide in 
the object-holder, with its pseudopodia extended. He then 
notices that all the filaments that are lengthening rapidly 
and in a straight line are rounded at their extremities so as 
to form nodular swellings, either globular, heart-shaped, or 
cylindrical. This terminal swelling is granular, like the rest 
of the filament, and the granules are, like itself, in a constant 
tremulous movement. ‘The nodule advances as if feeling its 
way, inclining hither and thither, and fresh granules continue 
to flow in from the base of the thread, whilst others retire 
along it. If the filament has advanced some way without 
encountering any obstacle, it curves round, often at a tolerably 
right angle, and moves now in the new direction as if aware 
where to find other radiating pseudopodia. The instant it 
touches a neighbour, the nodular end breaks up like a vesicle 
full of fluid, and mingles its contents with those of the fila- 
ment it has encountered. When a broad filament meets a 
narrow one it will coalesce with it, but pursue its original 
course for a while, as if undisturbed. It is frequently to be 
observed that just as one is expecting approaching fibres to 
coalesce, they pass close to each other in different planes. 
The coalescence does not ensue even on direct contact. 
Consequently either an act of volition must assist, or an 
obstruction has to be overcome, as when two drops of oil 
will only flow together on being pricked with aneedle. That 
volition comes into play is evident, since the filaments of 
different individuals never unite, but retreat from each other 
as from a determined foe. The passage of a granule from 
one filament to another may be considered as conclusive 
of their coalescence. It is very interesting to feed these 
animals on carmine. The granules adhere to and circulate 
within the pseudopodia, and the more minute the particles the 
more rapid the motion. Some glide towards the peripheral 
end of the filament; the majority are received into the in- 
terior of the creature. One granule of carmine overtakes 
the other, and if two meet, the one carries the other with it. 
Schultze has even known masses of carmine produced by the 
adhesion of many small ones to be dragged away, although 
ten times the diameter of the threads. Even those threads 
in which a centripetal stream is most marked, not only do 
