Cytology and Movements of the CyanophycecB. 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 

 "8." 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£e, 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 



