16 



A longitudinal split is described as occurring in them earlier 

 or later in this period. Mottier is convinced that this is 

 the longitudinal split observed in the earlier prophase, 

 and Miss Nichols in Sarracenia^^ looks upon it as the 

 dividing line that separates the daughter chromosomes of 

 the next or homotype division. 



Telophases are stages dealing with the movements 

 of the chromosomes within the daughter nuclei. The 

 chromosomes apparently join ends^ and form a new 

 temporary spirem, but in this heterotype mitosis nothing 

 approaching an ordinary resting nucleus is reached (Fig. 19) 

 A membrane now covers in each daughter nucleus and the 

 division is completed. Allen did not find a nucleolus ni 

 the daughter cells of Lilium at this stage. 



The heterotype form of mitosis is sometimes viewed 

 as a qualitative division, i.e., that there are differences in 

 the construction of the chromosomes, which may be of 

 physical, chemical or other nature, but to what extent is an 

 open question. Mottier thinks that as all the chromomeres 

 in a spirem are not always paired, especially the smaller 

 ones (Fig. 14), the probabilities are that these may 

 become part of one chromosome or another, and "if we 

 are in anyway justified in ascribing some individual quality 

 or qualities to these apparently unpaired granules, then we 

 are justified in concluding that some chromosome or 

 chromosomes are to that extent hereditarily different from 

 others."" 



In Monocotyledons coincident with the telophase 

 stages, an equatorial plate of minute granules, microsomes, 

 appears generally ; this develops into a wall separating the 

 two daughter cells — successive division — each of which 

 therefore receives one-half of the divided spindle threads. 

 These fibrils remain outside the nucleus, and merge with 

 the cytoplasm of the cell (Fig. 20). 



