STRUCTURE OF NUCI,EI 



543 



(hf^ 



Fig. 136. — Diagrams illustrating the process of indirect cell-division or mitosis. 



A, the resting cell ; 6, C, D, successive phases in the formation and arrangement 

 of the chromatin-loops and of the nuclear spindle ; E, F, G, separation of the two 

 sets of daughter chromosomes and their passage towards the poles of the spindle ; 

 H, division of the cell-body and formation of the two nuclei; I, division of a 

 plant-cell, showing the formation of the cell-wall (c. «-) by means of a cell- 

 plate {cpi) 



c. centrosome ; chr. chromatin ; ;/«'. nucleoli ; nti. in. nuclear membrane ; j. 

 astrophere ; j/. spindle. (From Parker's Biology^ altered from Flemming, 

 Rabl, etc.) 



found a globular body, surrounded by a radiating arrange- 

 ment of the protoplasm and called the astrosphere (s) : it 

 lies close to the nucleus, and contains a minute granule 



