THE CELL AND THE TISSUES. 



Separation of segments into polar groups. 

 Appearance of connecting filaments. 



4. Daughter-Wreaths, or Asters : 



Beginning division of cell-protoplasm. 



5. Daughter-Skeins : 



a. Loose skein. 



b. Close skein. 



Completion of new nuclei. 

 Acquisition of nuclear membranes. 

 Reappearance of nucleoli. 

 Completed separation of cell-protoplasm. 

 Resting Daughter-Nuclei. 



FIG. ii. 



r, 



K 



Cells from the epidermis of very young larva of newt : A , resting nucleus ; B, close skein ; C, loose 

 skein ; D and E, mother-stars, seen from the polar field and appearing as the wreath stage ; F, mother- 

 star from the side ; G, migration of segments ; H, daughter-stars ; / and J, segments grouped about 

 new polar fields (in J the protoplasm exhibits constriction) ; A", daughter-skeins, division of nucleus 

 complete with slight consiriction of cell-body; L-, completed division of nucleus and protoplasm. 



As closely connected with the division of the ovum, and probably, 

 also, with that of many other cells, the behavior of the minute extra- 

 nuclear bodies the centrosomata (Boveri), or pole-corpuscles 

 (v. Beneden), and their surrounding attraction-spheres has 

 attracted the attention of recent investigators. The centrosome 



