20 ARKIV FÖR BOTANIK. BAND V2. N:0 9. 



under high magnifying powers, as a lot of dark grains which 

 are especially conspicuous in the periphery of the plate. In 

 a few cases the edge of the plate appeared as a distinct 

 ^ zigzag design (fig. 22) which intimates, that the distribution 

 of the chromatin to the daughter-nuclei takes place with 

 considerable regularity. 



Later on the nucleus becomes more oblong (fig. 16) and 

 thereby also the trophochromatin-body^ which by degrees 

 assumes the shape of a hand-weight while at the same time 

 the idiochromatic plate is split in two, the fate of which I 

 am not able to account for owing to the remarkably few 

 instances of this stage. But the two plates no doubt travel 

 each towards its own pole, and the trophochromatin goes 

 out right to the apices of the spindle. Shortly afterwards, 

 while the daughter-nuclei are still coherent (fig. 23, 24), two 

 distinct daughter-caryosomes become visible and in these 

 some darker bodies which are no doubt the idiochromatin. 

 The two nuclei then divide and slowly become rounded. The 

 radiating chromatin-filaments are very conspicuous at this 

 stage. A remarkable feature which Nawaschin^ already 

 mentions with regard to Plasmodiophora is, that at the close 

 of the anaphase one often sees something like a common 

 membrane which still connects the two daughter-nuclei so 

 that one gets the impression, that they are free cells not 

 nuclei (fig. 17, 18, 25). What this membrane is, is hard to 

 say, possibly it is a chemical precipitation-product on the 

 boundary between the nucleus and the surrounding cyto- 

 plasma. A few times I have seen a distinct centrodesmose 

 still connecting the caryosomes after the daughter-nuclei had 

 divided (fig. 30). Similar cases have been observed in many 

 other organisms of lower order e. g. in Gymnodinium fuco- 

 riim-^^ Küster, in Trypanosoma^^ and others. 



This method of nuclear division is now repeated several 

 times (fig. 26 — 29), the amoebae becoming schizonts with up 

 to 16 nuclei. By ordinary division the schizonts form bi- or 

 few-nucleate meronts which grow large and after lively nu- 

 clear divisions form secondary schizonts a. s.^ o. It is seen 

 that the amoebae-nuclei grow larger and larger in time, in 

 the first amoebae-generations they were quite small (fig. 11, 12). 



Then follows a transitional stage during which the nuclei 

 are subject to some changes before they enter into the final 



