D668 EZRA ALLEN 
day after birth, after which it is found to a slight degree in the 
mantle layer along the ectal lateral wall of the lateral ventricles, 
this layer persisting at least to the age of two years. The lat- 
est observation of dividing cells in this locality was in 120-day 
material. 
2. The rate of mitosis increases for a time after birth, reaching 
its high point at about the seventh day for the cord and cere- 
bellum and about the fourth day for the cerebrum. 
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