lXl2 ^ ' '- -' TMJ^j MOSLimOAL MAGAZINE. ' [voi. xxv. nc m 



be different, and the number avScertained was generally 10 

 (Fig. 24), and certain variations too were observed. The 

 behavior of chromosomes in this case is pretty interesting. In 

 one case I have observed a stage (Fig. 5), in which the seg- 

 mentation of the spirem threads was not yet complete. There 

 could be seen 9 segnjents or gemini and 2 incompletely segment- 

 ed gemini, of which the upper one in the figure was constricted 

 in the middle part, apparentlj^ on their way of segmentation. 

 The completion of this process will result in the formation of 

 12 gemini, the number which is common among the sugar 

 corns. But if the segmentation here is suppressed, there will 

 be a giant gemini together with the ordinary ones. In fact I 

 have observed in several cases an extraordinary large geminus 

 in addition to 8 of ordinary size (Figs. 25, 26). The true 

 nature of the event is, however, unknown. A sticking together 

 of chromosomes after the segmentation has been observed by 

 MiYAKE (3) in Galtonia and Tradescantia. 



Interkinesis and Momctype Division. 



The chromosomes in the heterotype spindles make their 

 journey towards the poles and crowd into a lump, so closely 

 that their individuality is scarcely recognizable. Many ex- 

 tranuclear nucleoli are found scattered in the cytoplasm and 

 some of them are at the margin of the nuclear plate. As the 

 new nuclei are formed and the vacuoles in them grow greater, 

 the individuality of chromosomes becomes again to be clear. 

 Then the chromosomes elongate by and by, and their longi- 

 tudinal splitting gets very clear, where they take as a rule 

 a form like x, which reminds us of gemini at diakinesis 

 (Figs. 27, 28). The behavior of chromosomes at this stage is 

 rather peculiar. The number of chromosomes is always 10 so 

 far as I have examined in 'White flint.' The nucleolus may 

 appear as usual in this stage, but may be absent. On the 

 further progress the chromosomes shorten again and become 

 thickened as before, and with the disappearance of the nucleo- 

 lus and nuclear membrane they enter into the homotype 



