COMPARED WITH THOSE or ANIMALS. 



59 



Thus as soon as the first inflection can be traced in the 

 walls of the cell, the nucleus begins to undergo subdivi- 

 sion, and when the cell is finally divided, each cavity con- 

 tains a portion of the nucleus. These two i)ew cells with 

 their contained nuclei again subdivide in a similar manner, 



Development of cartilage cells. A, original cell; B, tlie same beginning to 

 divide ; C, the same, showing complete division of tlie nnclens ; F, the same with 

 the halves of the nucleus separated ; G, and H, continuation of the same pro- 

 cess; by continued cleavage in the same direction, and the ultimate produc- 

 tion of a longitudinal series of cells. — Carpenter. 



producing a filament or row of cells, when the division takes 

 place in one direction, and a plane or solid mass of them, 

 when the cleavage takes place in two or more directions. 



3. Formation oe cells by gemmation ou BUDDiNa. 



This is well seen in Conferva glomerata, Fig. 13, which in- 

 creases,- not only longitudinally by the repeated subdivision 

 and expansion of the cells at the extremity of its filaments, 

 but laterally by a process of outgrowth or budding. A oer- 



