728 ROBERT MCCARRISON. 
which and approximately at right angles to it is a shorter 
fissure, which further divides up the protoplasm (text-fig. 23). 
Movements of the protoplasm and alterations in the position 
of the nuclei within the capsule are sometimes seen. The 
nuclei, four in number, usually lie clumped together or in the 
position shown in the figure (text-fig. 23). They are clear, 
spherical bodies of uniform size, very sharply defined, and 
sometimes showing a central dot, features which are well 
brought out by staining (text-fig. 24). When the organism is 
Trext-FIG. 10. 
Trxm=niG, 12: 
Trxm-pire, 11. 
Text-fig. 10—Ameeba Il. Encystedameba. Protoplasm filled 
with spherical hyaline masses of variable size. Two chromatin 
masses are seen in the protoplasm. Chromatin heaped up at 
opposite poles of nucleus ; karyosome well marked. 
Text-fig. 11—Ameba I. Encysted ameba. Protoplasm 
shows hyaline masses of larger size. Nucleus has divided into 
two. Reticular structure of nucleus and karyosome seen. 
Text-fig. 12—Ameba I. Encysted ameba. Protoplasm 
shows single hyaline mass. Nuclei as in Text-fig. 11, but of 
larger size. 
stained the capsule is not coloured, and it appears to be open 
at its broader end. The granular protoplasm sometimes 
stains so deeply that no structure can be made out. In the 
more faintly stained animals the protoplasmic fissures referred 
to can be seen, but not with such distinctness as in the living 
animal (text-fig. 24). Sometimes the protoplasm, with its con- 
tents, is seen contracted up at one side of the capsule. The 
size of this animal in its longest diameter is fairly constant, 
and measures in the live state 144-15 pu. 
