Vol. 2] Gardner. — Cytological Studies in Cyanophyceae. 257 



ausnahmslos in den Gebilden wieder findet, die wir Kernfaden 

 und Chromosomen nennen, so darf ich diese Substanz wohl als 

 Chromatin bezeichnen" (p. 122). 



Phillips. According to this author, the chromatin exists in 

 the "central body," the nucleus, of the resting cell, in the form 

 of "hollow vesicles" (p. 284). These hollow vesicles he iden- 

 tifies as being the same as the ' ' slime balls ' ' of other authors, and 

 the "red granules" of Butchli (p. 282). 



Olive. Globular, or irregularly shaped, presumably solid 

 granules (p. 35). 



The Behavior of Chromatin at the Beginning of Cell Division. 



Kohl. "Der dicke Kernfaden durchzieht in Windungen den 

 Kern" (p. 173). 



Phillips. The chromatin of the "vesicles" becomes diffused 

 through the "central body," the nucleus, and then forms itself 

 "into a more or less loose network" (p. 295) ; and "the chro- 

 matin is arranged on the spireme thread in granules" (p. 325, 

 fourth conclusion). 



Olive. The chromatin granules become embedded in a "seg- 

 mented spireme" in Gloeocapsa, and in a "convoluted spireme" 

 in other species. 



Spireme. 



Kohl. The spireme is formed by the union of chromosomes 

 from the preceding cell division, and is divided crosswise into a 

 definite number of pieces, preparatory to a new cell division (p. 

 173). 



Phillips. Two processes are possible with the "loose net- 

 work." It is either directly constricted into two portions (p. 

 296), or it may form into "a single coiled linin thread or spi- 

 reme, ' ' which breaks up into an indefinite number of pieces which 

 arrange themselves parallel to each other and to the long axis of 

 the cell (p. 296) . Of the further history of the thread in the first 

 process we have no record. 



Olive. The spireme never breaks into chromosomes or seg- 

 ments. Each chromatin granule in the spireme is looked upon as 

 constituting a "chromosome" which never loses its identity as 

 such throughout the life history of the plant (p. 36). 



