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J. D. SIDJ>ALL. 
ensuing two hours were very considerable. By the follow- 
ing morning it had again become nearly spherical, and 
showed a tendency to divide into four parts by constriction. 
On the 17th, at 9 a.m., all the contents were found to have 
been expelled from the test during the preceding night, and 
the now naked sarcode had divided into four unequal por- 
tions (PI. XV, fig. 10), the empty, cast-off integument lying 
near to them in a wrinkled mass. The four separated por- 
tions changed shape very slightly and slowly, delicate blunt 
extensions of transparent protoplasm occasionally protrud- 
ing from the edges of each. In the evening of the same day 
rapid changes were continually going on ; the sarcode passing 
in sheets from one portion to the other. The drawing at 
PI. XV, fig. 11, gives a good general idea of the phenomena at 
this stage, though the actual condition varied every instant. 
The principal masses literally poured their sarcode one into 
the other. New centres towards which all would flow were 
formed every few minutes. Some of these for a short time 
would form separate and distinct masses, and then reunite 
by the coalescing of the sarcode extensions ; so that there 
was sometimes but a single mass, which within a few 
minutes might be broken up into half a dozen. These 
alterations continued for several hours, during which time 
no trace of a nucleus, which had become invisible on the 
first constriction of the Rhizopod, could be found. On the 
following morning, December 18th, 9 a.m., the w'hole had con- 
tracted into one principal mass (from which both lobose and 
filamentous pseudopodia w^ere freely extended) except some 
minute detached patches of the sarcode which were lying at 
some distance from it. These exhibited feeble amoeboid 
movements so long as they remained free, but were at once 
reabsorbed into the principal mass on coming in contact 
with any of its pseudopodia. Examined again in the even- 
ing of the same day it \Vas found in the same condition, but 
a still larger number of the outlying amoeboid particles of 
sarcode had during the interval become detached. One 
very small spheroidal particle (PI. XV, figs. 15, a, 5), contain- 
ing rather larger granules than those usually present in the 
sarcode, was removed to a considerable distance, and care- 
fully watched until January 25th, by which time it had 
gradually given off all its contents, and apparently melted 
away. By December 18th, a very large number of Amoebae, 
differing in no recognisable way from the ordinary forms, and 
evidently separated from the sarcode which had been con- 
stantly in motion for the past nine days, w'ere travelling 
about all over the cell cover. These, when once fairly 
