Cytology and Movements of the Cyanophycece. 267 



bodies." By treating Oscillaria with the above stains, he 

 found in each cell a collection of rounded black granules 

 which reacted like the "nuclei of the bacteria." These 

 granules surrounded one or more large drops in the middle 

 of the cell in such a manner that the more delicate granules 

 were at the periphery of the cell, thus giving the nucleus the 

 appearance of a collection of round grains of chromatin 

 which stained with haematoxylin similarly to his bacterial 

 nuclei. Division was direct. Hansgirg (37) investigated 

 the formation of glycogen in the plant cell, and found that 

 this substance was normally present in Oscillaria (34). In 

 working upon the question of the chromatophore and cell 

 nucleus, he studied (36) Chroodactylon IVolleanum, Gloco- 

 theca and other forms, and concluded that there was a 

 sharply marked cell nucleus and chromatophore in each cell 

 of the unicellular forms, but that in the thread forms, the 

 general protoplasm discharged the function of both these 

 organs. He saw the granules which Schmitz called "slime 

 balls," and found them to be soluble in concentrated sul- 

 phuric acid and in a 10 per cent, solution of potassium 

 hydrate. They were not stained by iodine or hsematoxylin 

 in the same manner as the surrounding protoplasm and he 

 thought them to be paramylum granules. Hansgirg's figures 

 are not clear, and leave a great deal to be guessed at by the 

 reader, but the fact that the unicellular forms were found 

 to have the nuclei and chromatophores while the filamentous 

 forms did not, though treated in the same manner, would 

 lend color to the contention of Bornet and Flahault (89) 

 who did not consider Chroodactylon IVolleanum as belong- 

 ing to the Cyanophyceae. Goebel (30) stated that there was 

 no nucleus in the Cyanophycean cell, but with Schmitz he 

 considered that there were granules of nuclear matter scat- 

 tered throughout the cytoplasm. The cell wall, when swol- 

 len, showed distinct stratification. It frequently deliquesced 

 and became a thin jelly, in which the cells lay scattered. 

 Fischer (28) devoted considerable space to proving that 



