"Humility is like a tree, whose root when it sets deepest in the earth rises higher, and spreads fairer and stands surer, and lasts longer, and every step of its descent is like a rib of iron."

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From the point of view of the pure morphologist the recapitulation theory is an instrument of research enabling him to reconstruct probable lines of descent; from the standpoint of the student of development and heredity the fact of recapitulation is a difficult problem whose solution would perhaps give the key to a true understanding of the real nature of heredity.

— E.S. Russell