ongates and decre, 

 •esent the appearan 



The above outline 



pol,- of the dividing nucleus, designat.-d first l.v Kol as "^r*" 

 later by Van Beneden as "attractive sphere*' and quite recently 

 by Boveri as "archoplasmic sphere*." 



'The central area of the arehoplasni (fig. 10. a.) is situated in 

 the cytoplasm near the nuclear membrane, and from it, as a 

 centre there radiate out in all directions the granular archo- 

 plasmic filaments or radiating stria, of th. asters, some directed 



arehoplasni is sometimes occupied by a definite body the so- 

 called centrosome. The fundamental importance of the function 

 of the arehoplasni and its centrosome is yet rather doubtful. 

 Van Beneden looks upon it as a permanent organ, equal in 

 value to the nucleus itself. Guignard, as we shall shortly see, 

 is inclined to assign to it paramount importance in cell divi- 

 sion, as directing and guiding the distribution of the dm. matin 

 elements. 



When we examine a daughter nucleus at the close of k a is- 

 okinetic division, we see at one side of it the archoplasmic 

 sphere in the position it occupied during the process of divi- 

 sion. Shortly before a new division starts (or we may say as the 

 first step in the next division) this archoplasmic sphere divides 

 into two (fig. 11) and the two new archoplasmic spheres thus 

 formed, pass around the nucleus in opposite directions until 

 thev come to occupy points on exactly opposite sides, when their 

 effect is soon shown by the starting of the phenomenal changes 

 of karvokinetic division. Thus it is seen as new nuclei arise 

 bv division, so also the new archoplasmic spheres arise in 

 in the same manner. 



