Lest the title mislead someone expecting to find in the following pages an account of the processes of assimilation and of respiration, that presumably take place during regeneration, I ought to state that I shall deal only with the physiology of the growth process as shown in the regeneration of a new part.Morphogenesis does not express my meaning in all respects, for I am not concerned so much with changes in form as with the rate of growth and of differentiation.If I have taken a liberty in using the term physiology to cover these kinds of changes, my excuse must be that we are dealing with phenomena that lie on the borderIand, where physiology and morphology overlap, and appear to merge into each other.
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Thomas Hunt Morgan (1906) studied this question.