Jennings, H. S.
1912. Age, Death and Conjugation in the Light of Work on Lower Organisms. Pop. Sci. Mo., Vol. LXXX, pp. 563-577.
Death is due to differentiation and not to a “running down” of the organism.
Lillie, F. R.
1909. The Theory of Individual Development. Pop. Sci. Mo., Vol. LXXV, pp. 239-252.
Holmes, S. J.
1904. The Problem of Form Regulation. Archiv für Entwickelungsmechanik der Organismen (Roux), Bd. XVII, pp. 265-305.
1907. Regeneration as Functional Adjustment. Jour. Exp. Zoöl., Vol. IV, pp. 419-430.
Wilson, E. B.
1905. The Problem of Development. Science, N. S., Vol. XXI, pp. 281-294.