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THE BEGINNINGS OE LIFE, 



selves capable, after one or several developmental stages, of 

 being converted into PlanaricE. There might possibly be a 

 reversion of the comparatively undifferentiated matter of the 

 ovum, after it had undergone certain unusual changes, into 

 an organism of a lower type ; but though such an outcome 

 from the t%% of a Planaria might be, as it were, an occa- 

 sional and accidental occurrence, it could not on this account 

 alone be regarded as one of the regular stages in the life- 

 history of PlanaricB. 



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