Degree of Injury and Rate of Regeneration 559 
tionof an organ may be made: The rate of regenerationof an organ 
increases with increase in additional injury to the individual up 
to an optimum degree beyond which further injury leads to a 
decrease in rate. The position of the optimum is different in 
the different organs of an individual and in corresponding organs 
of different species. The amount of the optimum degree of 
additional injury is also changed with change in the level of 
removal in the organ under observation. 
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