Cytology and Movements of the Cyanophycee. 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 hematoxylin 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 Osctllaria (34). In 
working upon the question of the chromatophore and cell 
nucleus, he studied (36) Chroodactylon Wolleanum, Gloeo- 
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 Io per cent. solution of potassium 
hydrate. They were not stained by iodine or hematoxylin 
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 Wolleanum as belong- 
ing to the Cyanophycez. 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 
