408 The Cell Ftrurfttre of the Oyaiwptyceai. [Oct. 9, 



of the nucleus ; and if we conceive that, in a very rudimentary stage 

 of cell development, the chromatin was diffused through the cytoplasm 

 either in the form of granules or in a liquid condition, then it is 

 not improbable that the accumulation of the chromatin in a single 

 chromatin granule, as in some protozoa, or in a granular network 

 inside a vacuole as in the Cyanophycese, would indicate a developmental 

 stage in the evolution of the nucleus. 



Delations of the Cyanophycew to other Groups. So far as the structure 

 of the cell is concerned, the Cyanophycese do not appear to have any 

 very definite characteristics which connect them with any known 

 group of plants, and certainly not with the Algse. They may possibly 

 be allied to the bacteria with which they appear to have some 

 features in common, but so far as our present knowledge goes their 

 position with respect to other groups is as indicated in the following 

 diagram : 



Cyanophyceae. 



Bacteria. Fun <ri. 



Flagellateae. Rhizopodia. 



v 



Protozoa. 



