Cytology and Movements of the Cyanophycee. 333 
Fig. 22. Portion of Fig. 21, more highly magnified, showing the 
chromatin balls. 
Fig. 23. Same as Fig. 22, but showing the chromatin balls dividing. 
Fig. 24. Chromatin vesicles crushed out of a cell of Oscillaria. 
Fig. 25. Portion of filament of O. Froehlichii treated with iodine and 
sulphuric acid. The protoplasmic threads are shown, which con- 
nected the end cells with the neighboring protoplasts. 
Fig. 26. Portion of filament of Oscillaria plasmolized with 95 per cent. 
alcohol. Shows each point of the contracted protoplast directed 
toward an opening in the cell wall through which it passed. 
Fig. 27. An isolated cell of Oscillaria treated with iodine and sulphuric 
acid and viewed from the “end.” Shows the openings in the cell 
wall and the finger-like processes of the protoplast which passed 
through them. 
Fig. 28. Isolated cell of Oscillaria viewed from the end. The central 
body here has assumed a deeply staining granular, irregular condi- 
tion, which probably precedes the formation of the heavy chromo- 
somes. 
Fig. 29. Copy of Fig. 42 in Fischer’s “Untersuchungen ueber den Bau 
der Cyanophyceen u. Bakterien.” This figure shows what Fischer 
considered to be radiating membranes from the ground mass of the 
central body. Compare with Figs. 38 and 40. 
Fig. 30. Cross-section of Oscillaria trichome, which has been cultivated 
in a full nutrient solution. The chromatin vesicles are very large 
and chromatic. The radiating lines from the ground mass of the 
central body are also accentuated. 
Fig. 31. Cross-section of Oscillaria trichome, which shows the chroma- 
tin vesicles of the central body, and the kinoplasmic threads radiat- 
ing from it to the cilia. 
Fig. 32. Copy of Fig. 44, from Fischer's “Untersuchungen ueber den 
Bau der Cyanophyceen u. Bakterien.” This figure shows in cross- 
section what Fig. 29 has in side view. These radiating membranes 
are evidently the radiating kinoplasmic threads which pass from the 
central body to the cilia. 
Figs. 33-36. Successive stages in the formation of the long hair-like 
organs on the end cells of Oscillaria. 
Fig. 37. Portion of trichome of Oscillarta grown in full nutrient solu- 
tion. The chromatin vesicles are greatly enlarged. 
Fig. 38. Portion of filament of Osctllaria showing the radiating lines 
from the central body or nucleus, and the cilia along the sides. 
Fig. 39. Same as Fig. 38. Note the characteristic irregular arrange- 
ment of numbers of cilia on each cell. 
