THE VITAL PHENOMENA OF THE CELL 



211 



lobulated nuclei are frequently seen, and yet fragmentation does 

 not appear to occur in these cases, so that the lobnlation must not 



FIG. 103. Tradescantia virgiiiica. 

 division (after Strasburger, Fig. 193 

 methyl green. 



Cell nuclei of older internodes vmdergoing direct 

 : A from life ; B after treatment with acetic-acid- 



be considered to be the commencement of direct division. It is 

 apparently connected with metabolic processes in the nucleus (cf. 

 what is said upon the subject in Chapter VIII.). 



Nuclear multiplication 



by direct division occurs V a 



also amongst Protista ; 

 it is seen with especial 

 frequency in the group 

 of Acineta3, of which the 

 Podophrya gemmipara 

 (Fig. 104), described on 

 p. 229, is an instructive 

 example. 



3. Endogenous Nuclear 

 Multiplication, or the 



Formation Of Multiple FIG. lOt. Cell-budding. Podoplirya gemmipara 



Nuclei. with t)ud8 ( R - Hertwi . Zoology, Fig. 21): a bads 



. . . which are becoming detached and developing into 



A third, very different ZO o8 P ores b = N nucleus. 



