ON CARYOKINESIS. 



185 



The later history of the archoplasm is, however, 

 better known. When we examine a cell at the close 

 of caryokinetic division, we see a small nucleus with the 

 archoplasmic sphere at one side of it, appearing some- 

 what like a satellite of a planet. This small nucleus is 

 one of the daughter nuclei of the previous generation, 



"N-^--, 



-^S 



Fig. 6. — Loligo. 



and is destined to become the mother nucleus of the 

 next. Just as new nuclei arise by the division of the 

 old one, so the new archoplasmic spheres also arise by 

 the division of the previous one. In the Cephalopod 

 blastoderm, the division of the mother archoplasmic 

 sphere into two daughter spheres could be observed with 

 sufficient clearness. In Ascaris, its division has been 



