MORPHOLOGY 



85 



IS 



;. S8. Dividing polleii-iiiother-cells of a Lily, somewhat diagrammatic. 1, Mother-cell with 

 resting nucleus ; 2, the separation of the chromosomes ; 3, synapsis ; 4, double filament in process 

 of fusion ; 5, spirem consisting of an apparently single filament derived from the fused double 

 filament ; 6, reappearance of the longitudinal split, the spirem still unsegmented ; 7, spirem 

 transversely segmented, into paired chromosomes ; 8, diakinesis ; 9, multipolar spindle ; 10, 

 spindle of the mother-nucleus, the nuclear plate composed of paired chromosomes ; 11, re- 

 duction division, the separating chromosomes showing partial separation of their longitudinal 

 halves ; 12, young daughter nuclei ; 13, the longitudinal halves of the chromosomes (daughter 

 chromosomes) are arranged in pairs on the nuclear spindles ; 14, the spindles of the daughter 

 nuclei ; 15, separation of the daughter chromosomes ; 16, young stage of the grand-daughter 

 nuclei, (x about SOO.) 



