258 Phillips on a Comparative Study of the 



(102) reaffirmed a part of the above observations, but modi- 

 fied his view concerning the distinction between the central 

 cytoplasm and the chromatophore. He now considered that 

 there were two forms of granules, the cyanophycin granules 

 of Hieronymus, and the slime balls of Palla, the former 

 being connected with the central body by means of threads 

 in their earlier stages. At certain times, quite simultane- 

 ously, the cyanophycin granules would lose their cyanophy- 

 cin, and become slime balls and z'ice versa. When the cyano- 

 phycin was extruded into the cell, it might crystallize in the 

 cytoplasm or it might disappear. These granules had a 

 particular protoplasmic framework and were organs of the 

 cell. The slime balls could flow together to form a central 

 mass, which became the "central substance" of other authors 

 (Hieronymus and Zacharias). This central substance 

 might become rounded off, with a drop of cyanophycin in its 

 centre, when it resembled a cell nucleus. The central sub- 

 stance might break up in two ways : either by formation of 

 a large number of fine granules suspended in chains which 

 finally separated and became slime balls by growth, or the 

 central body might divide into 2, 4, 8, etc., bodies which 

 became the slime balls. These, finally, might take up cyano- 

 phycin and become cyanophycin granules. This explained 

 wh)' slime balls and central substance, or slime balls and 

 cyanophycin granules were seldom seen together in the same 

 cell. In the same year ( 1894) Zukal published the results of 

 another investigation (loi) in which he held that the chro- 

 matophore had a webbed or fibrillar structure. He 

 reaffirmed the general points of his former observations, but 

 augmented them. He now found that the youngest cells 

 were colorless and had no webbed chromatophore, which 

 was a later development. It segmented out of the cyto- 

 plasm, dividing the cell into smaller portions or units. The 

 granules were formed by certain points in the fibrils which 

 gradually enlarged until they became granules similar to 

 the "red granules" of Biitschli. These granules represented 



