Cytology and Movements of the Cyanophycee. 255 
mal structural appearance in the Cyanophycean cell. They 
are generally to be seen in all Cyanophycezx, and in Gloeo- 
trichia and many other Rivulariacez they are a constant fea- 
ture. (5) The granular bodies which appear in the Cyano- 
phycean protoplast, are always observed outside the ‘cen- 
tral body.’ According to their reactions, they are divided 
into two widely different groups, the “cyanophycin gran- 
ules’ and the ‘slime balls.’ The cyanophycin granules, 
which under ordinary conditions apparently consist of a 
firm substance, are easily soluble in dilute hydrochloric acid, 
are colored blue by hematoxylin, and when stained intra- 
vitam, retain no methyl blue. They are generally found in 
the outermost part of the periphery of the chromatophore, 
and are doubtless to be regarded as the first visible assimila- 
tion product of the activity of the chromatophore. In the 
spores are placed the necessary reserve materials for their 
germination. The slime balls, which are composed of a 
tenacious, flowing substance, are insoluble in dilute hydro- 
chloric acid, are colored red-violet with hematoxylin, and 
store up methyl blue during intra-vitam staining. They 
are closely placed around the central body, and only occa- 
sionally appear further out in the chromatophore. Their 
significance in the cell is not clear. The ‘nucleolus,’ the 
‘central substance’ and the ‘red granules’ of other authors 
are bodies identical with the slime balls. (6) In the germ- 
ination of Gloeotrichia spores, oil appears in the chromato- 
phores of the cells. Zukal had also noticed this in other 
Cyanophycee. It can be established conclusively that the 
Cyanophycean protoplast is made up of at least two different 
parts, sharply distinguished from one another, and it is ques- 
tionable whether we should call the central body a cell 
nucleus.” Following this he gave a somewhat lengthy dis- 
cussion of the phylogenetic relationship of the central body 
to the cell nucleus, and he concluded that on account of the 
“lack of a chromatin framework, the absence of nuclei, the 
direct division which may be more complicated than it 
