70 EI SEN. [Vol. XVII. 



The various phases of mitosis now follow according to the 

 somatic process. There are twenty-four chromosomes on 

 the central spindle, and the result of the mitosis is also 

 twenty-four chromosomes carried to each daughter-nucleus. 

 These become confluent, after which the nucleus enters a stage 

 of growth. In this stage the appearance of the nucleus is very 

 much the same as in the imperfect stage of rest, just before 

 the beginning of the mitosis. This stage also marks the be- 

 ginning of the auxocyte. There are several generations, but 

 only one with polymorphous nuclei, the others having round 

 nuclei. 



B. The Chj'OJHOSomic Process iji the Aiixocytes. 



A Stage of Grotvth, during which the daughter-cell of the 

 former mitosis increases in size and finally reaches an imper- 

 fect resting stage. In this stage the leaders are formed and 

 their ends connected with the chromoplasts, of which there 

 are two or more resulting from division of the original chromo- 

 plast. The chromioles are in groups of three, and each group 

 is surrounded by a film of chromoplasm. The leaders are thus 

 made up of numerous small chromomeres, connected by a linin 

 string and suspended in a linin network. There are several 

 linoplasts of various sizes (Figs. lo, ii). The two spheres are 

 perfectly formed ; a perfect archosome with two centrioles is 

 generally present in the granosphere. 



Bouquet Stage with Twisted Leaders. — In this stage the 

 leaders have contracted to about one and one-third the diam- 

 eter of the nucleus. They are bent and somewhat twisted, but 

 their arrangement is still so regular as to present the appear- 

 ance of a bouquet. One end of each leader in the bouquet is 

 attached to the chromoplast, of which at this stage there is one 

 or a few. There are many chromomeres, several linoplasts, 

 and a perfect network of linin. The ends of the leaders, or 

 spireme segments, point generally directly towards the spheres. 

 This is, however, not always the case, as sometimes the narrow 

 part of the bouquet points upwards or even in an opposite direc- 

 tion to the spheres. It appears, therefore, that the nucleus in 

 the bouquet stages regularly revolves in such a way that the 



