アオミドロの細胞の生長と分裂について (I)

抄録

1.In the species of Spirogyra observed, the cells seem to go through the following four stages during the interval between one cell division and another: that is, (1) stage of nuclear division, (2) stage of nuclear movement (small cell stage), (3) stage of cell growth (stage of medium-sized cell), (4) resting stage (large cell stage).
2. In the same filament of Spirogyra, small cells must be younger than large cells.
3. In the small cells, the further the nucleus is apart from the center of the cell, the shorter the time elapsed after the division seems to be.
4. Cell divisions are found in the scattered portions of the filament of Spirogyra.
5. It appears that a cell division in one part of the filament induces divisions in the neighbouring cells in the same filament.