360 BULLETIN OF THE 



The equatorial interval between the free ends of the filaments increases. 

 In the case of Salamandra there is something, like the " Kernfaden " of 

 Strasburger, occasionally left stretched between the separating filaments, 

 but they are not continuations of the substance of which the nuclear 

 filaments are composed, for tliey are not stainahle. 



Phase 6. Star form of the daughter nuclei. The filaments of each 

 half of the nucleus — till now directed toward the equator of the cell — 

 begin to spread out so as to lie more nearly parallel with the equatorial 

 plane, and thus a somewhat flattened starlike figure is produced. The 

 axis of division (i. e. the line perpendicular to the centre of the plane of 

 division) now becomes curved, so that one or the other of these stars is 

 seen more en face, and then exhibits a free central space. Indications 

 of constriction often appear at this time on one side of the cell. 



Phase 7. Crown form, and glomerule form of daughter nuclei. In 

 this, which resembles Phase 2 (mother nucleus), the two crown-shaped 

 nuclear masses have a somewhat flattened concavo-convex form, the con- 

 vexities being directed toward the equator. In this phase the cell is di- 

 vided by a continuous, constantly advancing constriction, and without 

 any differentiation within the cell in the equatorial plane. That is to say, 

 there is no evidence of a "Zellplatte." The central and subcentral 

 portions of the protoplasm are comparatively passive in this cell division. 

 If there is a " contraction," it is to be located in the cortical layer of the 

 protoplasm. If it is either wholly or in part a matter of attraction in 

 totality (Gesammtattraction) toward polar centres, then it must be said 

 that the grouping (readjustment) takes place so imperceptibly that its 

 progress finds distinct expression only at the periphery. 



Phase 8 (" if such is to be distinguished "). Trestle form of daughter 

 nuclei, and reversion of the same to the quiescent condition. Duriiig this 

 phase the nuclear filaments assume a direction perpendicular to the long 

 axis of the nucleus, and from that pass to a uniformly disposed trestle in 

 which the filaments are no longer curled. This becomes more and more 

 compact, and at the same time paler, while it increases in size. About 

 the beginning of this phase it also becomes sharply limited from the cell 

 plasm, and the intermediary substance becomes stainable. A veritable 

 membrane appears only after the trestle of uniformly disposed elements 

 has come into existence, and, as he thinks, is probably formed by a fusion 

 of the peripheral filaments of that trestle. The origin of nucleoli was not 

 discovered. 



From these latter phases it is clear that the daughter nuclei have at 

 first a flattened stellate form ; that this passes into that of a crown of 



