VEGETABLE CELLS. 



Through this, free cells originate in the contents of the 

 parent-cell. The nuclei are in some cases already visible 

 during the individualization of the contents ; sometimes 

 they do not become visible until afterwards ; in certain 

 cases they have not hitherto been perceived. 



2. A single nucleus originates, which lies in the midst 

 of the accumulation formed by the whole contents of one 

 cell, or of two conjugated cells. This accumulation forms 

 a single free cell in the empty cavity of the parent-cell. 

 The nucleus does not become visible until the develop- 

 ment of the germ-cells to new plants. 



3. Several nuclei originate in the contents of the pa- 

 rent-cell, distributed in a regular arrangement. Each of 

 these individualizes the contents of the parent-cell, through 

 attraction, with a force only limited by that of the other 

 nuclei. At the limits which separate the field of action 

 of each nucleus, which, ceteris paribus, are equally distant 

 from each pair of nuclei, the membranes are formed. In 

 other words, the whole contents of the parent- cell divide 

 into just as many portions as there are nuclei ; a nucleus 

 lies pretty nearly in the middle of each portion ; the por- 

 tions are separated from each other by an extremely nar- 

 row space, in which each portion of contents secretes its 

 own membrane. The parent-cell divides, by parietal 

 cell-formation, into several secondary cells. 



4. A single nucleus originates in a short branch (in 

 the prolonged part), or in the terminal portion of a longer 

 branch of a cell. Under its influence, the whole contents 

 of the short branch or of the terminal portion of the longer 

 one, separate from the rest of the contents of the cell 

 and form a new cell, the membrane of which is partly 

 parietal (in contact with the internal surface of the branch), 

 and partly free (directed towards the cavity of the older 

 cell). But the parent-cell, excepting in the loss it has 

 suffered, remains unaltered. The nucleus has never been 

 perceived yet during the actual process ; it not unfre- 

 quently becomes visible afterwards. 



The definition of the INDIVIDUALIZATION OF THE CELL- 



