Cytology and Movements of the Cyanophycee. 261 
substance” (fiillsubstanz). Three kinds of granules ap- 
peared in all cells. One form, found mostly, though not 
entirely, in the central body and corresponding to the “red 
granules” of Biitschli or slime balls of Palla, he called “chro- 
matin granules” because in their reactions they showed the 
same characteristics as the chromatin of the higher plants. 
In size and number they varied greatly, but this variability 
did not affect their power of division, which took place 
through their arranging themselves in form of the figure 
“g* Each constricted later into two nuclei, caused by the 
ingrowth of a collar-like band from the lateral walls of the 
cell. To the second class of granules, corresponding to the 
cyanophycin granules of Borzi and Palla, he gave the name 
of “reserve granules,” considering them to be composed of 
reserve food akin to the starch of the higher plants. They 
were only found in the protoplasm, usually along the par- 
tition walls, and their number was very variable according 
to the condition of nourishment of the plant. They were 
most numerous in the spores. The third form of granules 
of a plasmatic structure, were denominated “microsomes.” 
They occurred at the nodal points of the vesicles of the pro- 
toplasm. No reason was assigned for believing them to be 
of a different structure from the protoplasm, other than that 
they had a slight tinge of color. The large bacteria he con- 
sidered to have a structure similar to that of the Cyanophy- 
ce, but the smaller forms, which Biitschli and others con- 
sidered as having only the central body without protoplasm, 
he thought to have an undifferentiated protoplast which cor- 
responded to the central body and the protoplasm combined. 
To this form of cell content he gave the name “archiplast,” 
retaining the name “protoplast” for differentiated cell con- 
tents as formerly used. Chromatin granules were often 
present, but strewn through the whole archiplast. His 
conclusion was that the central body was very similar to the 
nucleus of the higher plants and doubtless represented it, 
for when the organism was doubly stained with methyl blue 
