334 ABNORMALITIES OF THE LIFE-CYCLE [CH. 



go they appear to indicate that the question deserves to be tested by further 

 cytological enquiry. Such enquiry would not only bear interest in relation 

 to the chromosome-cycle itself: but it might also help to show what degree 

 of relation exists in plants between form and nuclear constitution. Yet still 

 the fact remains that crested varieties commonly show branching by equal 

 dichotomy. This may be held as a reversion to that state recognised in 

 Chapter V as the more primiitive. The fact of its occurrence in crested forms 

 of very various affinity may be held as supporting once more the general 

 thesis, that leaf-architecture in Ferns is based upon sympodial progression 

 from a primitive dichotomy. 



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